linux-kernel - [PATCH 4.4 007/342] af_unix: fix struct pid memory leak

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Message-Id: <20160301234528.224996264@linuxfoundation.org>
Date:	Tue, 01 Mar 2016 23:53:54 +0000
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	<linux-kernel@...r.kernel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<stable@...r.kernel.org>, Dmitry Vyukov <dvyukov@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Rainer Weikusat <rweikusat@...ileactivedefense.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 007/342] af_unix: fix struct pid memory leak

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

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

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

[ Upstream commit fa0dc04df259ba2df3ce1920e9690c7842f8fa4b ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/unix/af_unix.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -2332,6 +2332,7 @@ again:
 
 			if (signal_pending(current)) {
 				err = sock_intr_errno(timeo);
+				scm_destroy(&scm);
 				goto out;
 			}