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netlink: fix uninit-value in netlink_sendmsg

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commit 6091f09c2f upstream.

syzbot reported :

BUG: KMSAN: uninit-value in ffs arch/x86/include/asm/bitops.h:432 [inline]
BUG: KMSAN: uninit-value in netlink_sendmsg+0xb26/0x1310 net/netlink/af_netlink.c:1851

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet
2018-04-07 13:42:37 -07:00
committed by Greg Kroah-Hartman
parent d7309c4e42
commit 4b016f0e74
1 changed files with 2 additions and 0 deletions
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2
net/netlink/af_netlink.c
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@@ -1845,6 +1845,8 @@ static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
if (msg->msg_namelen) { if (msg->msg_namelen) {
err = -EINVAL; err = -EINVAL;
if (msg->msg_namelen < sizeof(struct sockaddr_nl))
goto out;
if (addr->nl_family != AF_NETLINK) if (addr->nl_family != AF_NETLINK)
goto out; goto out;
dst_portid = addr->nl_pid; dst_portid = addr->nl_pid;