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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)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 22 Mar 2017 11:56:56 +0000 (12:56 +0100)
commit4c94beba3aee225c8ef57d9eb0730d868d02c9cc
treefb016890089061c92774b0d4903189f3793f37e8tree
parent639fdd961af0e1bd23b73956b86602fc3c31509bcommit | 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
net/l2tp/l2tp_ip.c diff | blob | blame | history
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git