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

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Date:	Tue, 23 Feb 2016 21:42:03 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Rainer Weikusat" <rweikusat@...ileactivedefense.com>,
	"David S. Miller" <davem@...emloft.net>,
	"Eric Dumazet" <edumazet@...gle.com>,
	"Dmitry Vyukov" <dvyukov@...gle.com>
Subject: [PATCH 3.2 08/67] af_unix: fix struct pid memory leak

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

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

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>
[bwh: Backported to 3.2: cookie is *sicob->scm, not scm]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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;
 			}