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l2tp: avoid use-after-free caused by l2tp_ip_backlog_recv
authorPaul Hüber <phueber@kernsp.in>
Sun, 26 Feb 2017 16:58:19 +0000 (17:58 +0100)
committerJiri Slaby <jslaby@suse.cz>
Tue, 28 Mar 2017 13:49:20 +0000 (15:49 +0200)
commit86cd0c73a229a79215ffdfddf2788cfb73b268cd
tree1c652bd6972f73af843c89866aa8c61969e62d2ftree
parenta932e0a1a101e031b2b2eff4a87a80e9398ef6c5commit | diff
l2tp: avoid use-after-free caused by l2tp_ip_backlog_recv

[ Upstream commit 51fb60eb162ab84c5edf2ae9c63cf0b878e5547e ]

l2tp_ip_backlog_recv may not return -1 if the packet gets dropped.
The return value is passed up to ip_local_deliver_finish, which treats
negative values as an IP protocol number for resubmission.

Signed-off-by: Paul Hüber <phueber@kernsp.in>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
net/l2tp/l2tp_ip.c diff | blob | blame | history
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git