linux-kernel - [PATCH 3.13.y-ckt 118/138] af_unix: fix struct pid memory leak

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Message-Id: <1457565265-15195-119-git-send-email-kamal@canonical.com>
Date:	Wed,  9 Mar 2016 15:14:05 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Eric Dumazet <edumazet@...gle.com>,
	Rainer Weikusat <rweikusat@...ileactivedefense.com>,
	"David S . Miller" <davem@...emloft.net>,
	Luis Henriques <luis.henriques@...onical.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 118/138] af_unix: fix struct pid memory leak

3.13.11-ckt36 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Eric Dumazet <edumazet@...gle.com>

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@...gle.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Rainer Weikusat <rweikusat@...ileactivedefense.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
[ luis: backported to 3.16:
  - use siocb->scm instead of &scm ]
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>

Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/unix/af_unix.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index e6b0213..496ce9c 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2147,6 +2147,7 @@ again:
 
 			if (signal_pending(current)) {
 				err = sock_intr_errno(timeo);
+				scm_destroy(siocb->scm);
 				goto out;
 			}
 
-- 
2.7.0