netlink: extack needs to be reset each time through loop

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[ Upstream commit cbbdf8433a ]

syzbot triggered the WARN_ON in netlink_ack testing the bad_attr value.
The problem is that netlink_rcv_skb loops over the skb repeatedly invoking
the callback and without resetting the extack leaving potentially stale
data. Initializing each time through avoids the WARN_ON.

Fixes: 2d4bc93368 ("netlink: extended ACK reporting")
Reported-by: syzbot+315fa6766d0f7c359327@syzkaller.appspotmail.com
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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David Ahern 2018-01-10 13:00:39 -08:00 • committed by Greg Kroah-Hartman

parent 3c6e5f2f5e

commit 3eae0ba8c9

1 changed files with 2 additions and 1 deletions

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net/netlink/af_netlink.c

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