Patchwork [036/118] llc: Fix missing msg_namelen update in llc_ui_recvmsg()

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Submitter Luis Henriques
Date May 7, 2013, 1:38 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/242230/
State New
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Luis Henriques - May 7, 2013, 1:38 p.m. -stable review patch.  If anyone has any objections, please let me know.


From: Mathias Krause <>

commit c77a4b9cffb6215a15196ec499490d116dfad181 upstream.

For stream sockets the code misses to update 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. The msg_namelen update is also missing for datagram sockets
in case the socket is shutting down during receive.

Fix both issues by setting msg_namelen to 0 early. It will be
updated later if we're going to fill the msg_name member.

Cc: Arnaldo Carvalho de Melo <>
Signed-off-by: Mathias Krause <>
Signed-off-by: David S. Miller <>
Signed-off-by: Luis Henriques <>
 net/llc/af_llc.c | 2 ++
 1 file changed, 2 insertions(+)


diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index a13c3e2..445882cb 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -720,6 +720,8 @@  static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
 	int target;	/* Read at least this many bytes */
 	long timeo;
+	msg->msg_namelen = 0;
 	copied = -ENOTCONN;
 	if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))