From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Chuck Lever <chuck.lever@oracle.com>,
Anna Schumaker <Anna.Schumaker@Netapp.com>,
Sasha Levin <sashal@kernel.org>,
linux-nfs@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 4.19 445/671] xprtrdma: Fix use-after-free in rpcrdma_post_recvs
Date: Thu, 16 Jan 2020 12:01:23 -0500 [thread overview]
Message-ID: <20200116170509.12787-182-sashal@kernel.org> (raw)
In-Reply-To: <20200116170509.12787-1-sashal@kernel.org>
From: Chuck Lever <chuck.lever@oracle.com>
[ Upstream commit 2d0abe36cf13fb7b577949fd1539326adddcc9bc ]
Dereference wr->next /before/ the memory backing wr has been
released. This issue was found by code inspection. It is not
expected to be a significant problem because it is in an error
path that is almost never executed.
Fixes: 7c8d9e7c8863 ("xprtrdma: Move Receive posting to ... ")
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/sunrpc/xprtrdma/verbs.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
index 5ddbf227e7c6..2a1d8ec7f706 100644
--- a/net/sunrpc/xprtrdma/verbs.c
+++ b/net/sunrpc/xprtrdma/verbs.c
@@ -1558,10 +1558,11 @@ rpcrdma_post_recvs(struct rpcrdma_xprt *r_xprt, bool temp)
rc = ib_post_recv(r_xprt->rx_ia.ri_id->qp, wr,
(const struct ib_recv_wr **)&bad_wr);
if (rc) {
- for (wr = bad_wr; wr; wr = wr->next) {
+ for (wr = bad_wr; wr;) {
struct rpcrdma_rep *rep;
rep = container_of(wr, struct rpcrdma_rep, rr_recv_wr);
+ wr = wr->next;
rpcrdma_recv_buffer_put(rep);
--count;
}
--
2.20.1
next prev parent reply other threads:[~2020-01-16 18:49 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200116170509.12787-1-sashal@kernel.org>
2020-01-16 16:59 ` [PATCH AUTOSEL 4.19 312/671] NFS: Don't interrupt file writeout due to fatal errors Sasha Levin
2020-01-16 17:01 ` Sasha Levin [this message]
2020-01-16 17:04 ` [PATCH AUTOSEL 4.19 628/671] SUNRPC: Fix svcauth_gss_proxy_init() Sasha Levin
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