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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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NFS: remove page size checking code
Remove the page size checking code for a readdir decode. This is now done by decode_dirent with xdr_streams. Signed-off-by: Bryan Schumaker <bjschuma@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker
Trond Myklebust
parent
babddc72a9
commit
afa8ccc978
@ -423,9 +423,7 @@ nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
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struct page **page;
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size_t hdrlen;
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unsigned int pglen, recvd;
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u32 len;
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int status, nr = 0;
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__be32 *end, *entry, *kaddr;
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if ((status = ntohl(*p++)))
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return nfs_stat_to_errno(status);
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@ -445,59 +443,7 @@ nfs_xdr_readdirres(struct rpc_rqst *req, __be32 *p, void *dummy)
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if (pglen > recvd)
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pglen = recvd;
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page = rcvbuf->pages;
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kaddr = p = kmap_atomic(*page, KM_USER0);
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end = (__be32 *)((char *)p + pglen);
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entry = p;
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/* Make sure the packet actually has a value_follows and EOF entry */
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if ((entry + 1) > end)
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goto short_pkt;
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for (; *p++; nr++) {
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if (p + 2 > end)
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goto short_pkt;
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p++; /* fileid */
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len = ntohl(*p++);
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p += XDR_QUADLEN(len) + 1; /* name plus cookie */
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if (len > NFS2_MAXNAMLEN) {
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dprintk("NFS: giant filename in readdir (len 0x%x)!\n",
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len);
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goto err_unmap;
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}
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if (p + 2 > end)
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goto short_pkt;
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entry = p;
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}
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/*
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* Apparently some server sends responses that are a valid size, but
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* contain no entries, and have value_follows==0 and EOF==0. For
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* those, just set the EOF marker.
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*/
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if (!nr && entry[1] == 0) {
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dprintk("NFS: readdir reply truncated!\n");
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entry[1] = 1;
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}
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out:
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kunmap_atomic(kaddr, KM_USER0);
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return nr;
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short_pkt:
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/*
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* When we get a short packet there are 2 possibilities. We can
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* return an error, or fix up the response to look like a valid
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* response and return what we have so far. If there are no
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* entries and the packet was short, then return -EIO. If there
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* are valid entries in the response, return them and pretend that
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* the call was successful, but incomplete. The caller can retry the
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* readdir starting at the last cookie.
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*/
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entry[0] = entry[1] = 0;
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if (!nr)
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nr = -errno_NFSERR_IO;
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goto out;
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err_unmap:
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nr = -errno_NFSERR_IO;
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goto out;
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}
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static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
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@ -554,9 +554,8 @@ nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res
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struct kvec *iov = rcvbuf->head;
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struct page **page;
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size_t hdrlen;
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u32 len, recvd, pglen;
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u32 recvd, pglen;
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int status, nr = 0;
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__be32 *entry, *end, *kaddr;
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status = ntohl(*p++);
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/* Decode post_op_attrs */
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@ -586,83 +585,8 @@ nfs3_xdr_readdirres(struct rpc_rqst *req, __be32 *p, struct nfs3_readdirres *res
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if (pglen > recvd)
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pglen = recvd;
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page = rcvbuf->pages;
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kaddr = p = kmap_atomic(*page, KM_USER0);
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end = (__be32 *)((char *)p + pglen);
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entry = p;
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/* Make sure the packet actually has a value_follows and EOF entry */
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if ((entry + 1) > end)
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goto short_pkt;
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for (; *p++; nr++) {
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if (p + 3 > end)
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goto short_pkt;
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p += 2; /* inode # */
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len = ntohl(*p++); /* string length */
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p += XDR_QUADLEN(len) + 2; /* name + cookie */
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if (len > NFS3_MAXNAMLEN) {
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dprintk("NFS: giant filename in readdir (len 0x%x)!\n",
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len);
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goto err_unmap;
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}
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if (res->plus) {
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/* post_op_attr */
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if (p + 2 > end)
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goto short_pkt;
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if (*p++) {
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p += 21;
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if (p + 1 > end)
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goto short_pkt;
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}
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/* post_op_fh3 */
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if (*p++) {
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if (p + 1 > end)
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goto short_pkt;
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len = ntohl(*p++);
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if (len > NFS3_FHSIZE) {
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dprintk("NFS: giant filehandle in "
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"readdir (len 0x%x)!\n", len);
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goto err_unmap;
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}
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p += XDR_QUADLEN(len);
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}
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}
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if (p + 2 > end)
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goto short_pkt;
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entry = p;
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}
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/*
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* Apparently some server sends responses that are a valid size, but
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* contain no entries, and have value_follows==0 and EOF==0. For
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* those, just set the EOF marker.
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*/
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if (!nr && entry[1] == 0) {
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dprintk("NFS: readdir reply truncated!\n");
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entry[1] = 1;
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}
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out:
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kunmap_atomic(kaddr, KM_USER0);
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return nr;
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short_pkt:
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/*
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* When we get a short packet there are 2 possibilities. We can
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* return an error, or fix up the response to look like a valid
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* response and return what we have so far. If there are no
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* entries and the packet was short, then return -EIO. If there
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* are valid entries in the response, return them and pretend that
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* the call was successful, but incomplete. The caller can retry the
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* readdir starting at the last cookie.
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*/
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entry[0] = entry[1] = 0;
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if (!nr)
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nr = -errno_NFSERR_IO;
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goto out;
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err_unmap:
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nr = -errno_NFSERR_IO;
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goto out;
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}
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__be32 *
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@ -4200,12 +4200,9 @@ static int decode_read(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs_
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static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct nfs4_readdir_res *readdir)
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{
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struct xdr_buf *rcvbuf = &req->rq_rcv_buf;
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struct page *page = *rcvbuf->pages;
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struct kvec *iov = rcvbuf->head;
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size_t hdrlen;
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u32 recvd, pglen = rcvbuf->page_len;
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__be32 *end, *entry, *p, *kaddr;
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unsigned int nr = 0;
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int status;
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status = decode_op_hdr(xdr, OP_READDIR);
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@ -4225,71 +4222,8 @@ static int decode_readdir(struct xdr_stream *xdr, struct rpc_rqst *req, struct n
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pglen = recvd;
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xdr_read_pages(xdr, pglen);
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BUG_ON(pglen + readdir->pgbase > PAGE_CACHE_SIZE);
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kaddr = p = kmap_atomic(page, KM_USER0);
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end = p + ((pglen + readdir->pgbase) >> 2);
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entry = p;
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/* Make sure the packet actually has a value_follows and EOF entry */
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if ((entry + 1) > end)
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goto short_pkt;
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for (; *p++; nr++) {
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u32 len, attrlen, xlen;
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if (end - p < 3)
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goto short_pkt;
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dprintk("cookie = %Lu, ", *((unsigned long long *)p));
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p += 2; /* cookie */
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len = ntohl(*p++); /* filename length */
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if (len > NFS4_MAXNAMLEN) {
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dprintk("NFS: giant filename in readdir (len 0x%x)\n",
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len);
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goto err_unmap;
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}
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xlen = XDR_QUADLEN(len);
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if (end - p < xlen + 1)
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goto short_pkt;
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dprintk("filename = %*s\n", len, (char *)p);
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p += xlen;
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len = ntohl(*p++); /* bitmap length */
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if (end - p < len + 1)
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goto short_pkt;
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p += len;
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attrlen = XDR_QUADLEN(ntohl(*p++));
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if (end - p < attrlen + 2)
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goto short_pkt;
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p += attrlen; /* attributes */
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entry = p;
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}
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/*
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* Apparently some server sends responses that are a valid size, but
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* contain no entries, and have value_follows==0 and EOF==0. For
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* those, just set the EOF marker.
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*/
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if (!nr && entry[1] == 0) {
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dprintk("NFS: readdir reply truncated!\n");
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entry[1] = 1;
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}
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out:
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kunmap_atomic(kaddr, KM_USER0);
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return 0;
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short_pkt:
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/*
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* When we get a short packet there are 2 possibilities. We can
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* return an error, or fix up the response to look like a valid
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* response and return what we have so far. If there are no
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* entries and the packet was short, then return -EIO. If there
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* are valid entries in the response, return them and pretend that
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* the call was successful, but incomplete. The caller can retry the
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* readdir starting at the last cookie.
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*/
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dprintk("%s: short packet at entry %d\n", __func__, nr);
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entry[0] = entry[1] = 0;
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if (nr)
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goto out;
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err_unmap:
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kunmap_atomic(kaddr, KM_USER0);
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return -errno_NFSERR_IO;
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}
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static int decode_readlink(struct xdr_stream *xdr, struct rpc_rqst *req)
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