linux-kernel - [PATCH 4.3 45/55] net: fix uninitialized variable issue

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Message-Id: <20160120232229.729800119@linuxfoundation.org>
Date:	Wed, 20 Jan 2016 16:44:20 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Harald Freudenberger <freude@...ux.vnet.ibm.com>,
	Tadeusz Struk <tadeusz.struk@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.3 45/55] net: fix uninitialized variable issue

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

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

From: "tadeusz.struk@...el.com" <tadeusz.struk@...el.com>

[ Upstream commit 130ed5d105dde141e7fe60d5440aa53e0a84f13b ]

msg_iocb needs to be initialized on the recv/recvfrom path.
Otherwise afalg will wrongly interpret it as an async call.

Cc: stable@...r.kernel.org
Reported-by: Harald Freudenberger <freude@...ux.vnet.ibm.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/socket.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/socket.c
+++ b/net/socket.c
@@ -1702,6 +1702,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void
 	msg.msg_name = addr ? (struct sockaddr *)&address : NULL;
 	/* We assume all kernel code knows the size of sockaddr_storage */
 	msg.msg_namelen = 0;
+	msg.msg_iocb = NULL;
 	if (sock->file->f_flags & O_NONBLOCK)
 		flags |= MSG_DONTWAIT;
 	err = sock_recvmsg(sock, &msg, iov_iter_count(&msg.msg_iter), flags);