Patchwork [029/118] atm: update msg_namelen in vcc_recvmsg()

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Submitter Luis Henriques
Date May 7, 2013, 1:37 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/242238/
State New
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Luis Henriques - May 7, 2013, 1:37 p.m. -stable review patch.  If anyone has any objections, please let me know.


From: Mathias Krause <>

commit 9b3e617f3df53822345a8573b6d358f6b9e5ed87 upstream.

The current code does not fill the msg_name member in case it is set.
It also does not set the msg_namelen member to 0 and therefore makes
net/socket.c leak the local, uninitialized sockaddr_storage variable
to userland -- 128 bytes of kernel stack memory.

Fix that by simply setting msg_namelen to 0 as obviously nobody cared
about vcc_recvmsg() not filling the msg_name in case it was set.

Signed-off-by: Mathias Krause <>
Signed-off-by: David S. Miller <>
Signed-off-by: Luis Henriques <>
 net/atm/common.c | 2 ++
 1 file changed, 2 insertions(+)


diff --git a/net/atm/common.c b/net/atm/common.c
index 0c0ad93..f0a9b7e 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -520,6 +520,8 @@  int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
 	struct sk_buff *skb;
 	int copied, error = -EINVAL;
+	msg->msg_namelen = 0;
 	if (sock->state != SS_CONNECTED)
 		return -ENOTCONN;