[ 173/184] atm: update msg_namelen in vcc_recvmsg()
From: Willy Tarreau
Date: Tue Jun 04 2013 - 19:00:59 EST
2.6.32-longterm review patch. If anyone has any objections, please let me know.
------------------
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
[ Upstream commit 9b3e617f3df53822345a8573b6d358f6b9e5ed87 ]
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 <minipli@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
---
net/atm/common.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/atm/common.c b/net/atm/common.c
index 950bd16..6c82d72 100644
--- a/net/atm/common.c
+++ b/net/atm/common.c
@@ -473,6 +473,8 @@ 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;
if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */
--
1.7.12.2.21.g234cd45.dirty
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