[PATCH 3.2 08/67] af_unix: fix struct pid memory leak

[Ben Hutchings]

3.2.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@xxxxxxxxxx>

commit fa0dc04df259ba2df3ce1920e9690c7842f8fa4b upstream.

Dmitry reported a struct pid leak detected by a syzkaller program.

Bug happens in unix_stream_recvmsg() when we break the loop when a
signal is pending, without properly releasing scm.

Fixes: b3ca9b02b007 ("net: fix multithreaded signal handling in unix recv routines")
Reported-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Rainer Weikusat <rweikusat@xxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
[bwh: Backported to 3.2: cookie is *sicob->scm, not scm]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 net/unix/af_unix.c | 1 +
 1 file changed, 1 insertion(+)

--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2100,6 +2100,7 @@ static int unix_stream_recvmsg(struct ki
 
 			if (signal_pending(current)) {
 				err = sock_intr_errno(timeo);
+				scm_destroy(siocb->scm);
 				goto out;
 			}