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crypto: rsa-pkcs1pad - don't allocate buffer on stack

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Avoid the s390 compile "warning: 'pkcs1pad_encrypt_sign_complete'
uses dynamic stack allocation" reported by kbuild test robot.  Don't
use a flat zero-filled buffer, instead zero the contents of the SGL.

Signed-off-by: Andrew Zaborowski <andrew.zaborowski@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Andrzej Zaborowski 2015-12-12 00:03:51 -05:00 committed by Herbert Xu
parent 16f080aaad
commit 5319216dcf
1 changed files with 19 additions and 8 deletions
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27
crypto/rsa-pkcs1pad.c
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@ -110,21 +110,32 @@ static int pkcs1pad_encrypt_sign_complete(struct akcipher_request *req, int err)
struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
struct pkcs1pad_ctx *ctx = akcipher_tfm_ctx(tfm);
struct pkcs1pad_request *req_ctx = akcipher_request_ctx(req);
uint8_t zeros[ctx->key_size - req_ctx->child_req.dst_len];
size_t pad_len = ctx->key_size - req_ctx->child_req.dst_len;
size_t chunk_len, pad_left;
struct sg_mapping_iter miter;
if (!err) {
if (req_ctx->child_req.dst_len < ctx->key_size) {
memset(zeros, 0, sizeof(zeros));
sg_copy_from_buffer(req->dst,
sg_nents_for_len(req->dst,
sizeof(zeros)),
zeros, sizeof(zeros));
if (pad_len) {
sg_miter_start(&miter, req->dst,
sg_nents_for_len(req->dst, pad_len),
SG_MITER_ATOMIC | SG_MITER_TO_SG);
pad_left = pad_len;
while (pad_left) {
sg_miter_next(&miter);
chunk_len = min(miter.length, pad_left);
memset(miter.addr, 0, chunk_len);
pad_left -= chunk_len;
}
sg_miter_stop(&miter);
}
sg_pcopy_from_buffer(req->dst,
sg_nents_for_len(req->dst, ctx->key_size),
req_ctx->out_buf, req_ctx->child_req.dst_len,
sizeof(zeros));
pad_len);
}
req->dst_len = ctx->key_size;