iucv: Fix missing msg_namelen update in iucv_sock_recvmsg()
authorMathias Krause <minipli@googlemail.com>
Sun, 7 Apr 2013 01:51:54 +0000 (01:51 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 1 May 2013 15:56:39 +0000 (08:56 -0700)
commitcbafa8a778286c4bd59bd0b9c028b416e0e6ac29
tree2d65e5aeea3640071ca80e6e178fd00023c60eab
parent65f4ea22548ffdd868d9d98cf91f50bc9978fb69
iucv: Fix missing msg_namelen update in iucv_sock_recvmsg()

[ Upstream commit a5598bd9c087dc0efc250a5221e5d0e6f584ee88 ]

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 iucv_sock_recvmsg() not filling the msg_name in case it was set.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/iucv/af_iucv.c