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9P/RDMA: Protect against duplicate replies

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A well-behaved server would not send twice the reply to a request.
But if it ever happens...
This additional check prevents the kernel from leaking memory
and possibly more nasty consequences in that unlikely event.

Signed-off-by: Simon Derr <simon.derr@bull.net>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
This commit is contained in:
Simon Derr 2013-06-21 15:32:38 +02:00 committed by Eric Van Hensbergen
parent 3fcc62f4e8
commit 47229ff85e
1 changed files with 7 additions and 0 deletions
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7
net/9p/trans_rdma.c
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@ -294,6 +294,13 @@ handle_recv(struct p9_client *client, struct p9_trans_rdma *rdma,
if (!req) if (!req)
goto err_out; goto err_out;
/* Check that we have not yet received a reply for this request.
*/
if (unlikely(req->rc)) {
pr_err("Duplicate reply for request %d", tag);
goto err_out;
}
req->rc = c->rc; req->rc = c->rc;
req->status = REQ_STATUS_RCVD; req->status = REQ_STATUS_RCVD;
p9_client_cb(client, req); p9_client_cb(client, req);