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9e14379378
linux/net/xfrm
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Steffen Klassert 9e14379378 xfrm: Fix NULL pointer dereference when skb_dst_force clears the dst_entry. 
Since commit 222d7dbd25 ("net: prevent dst uses after free")
skb_dst_force() might clear the dst_entry attached to the skb.
The xfrm code don't expect this to happen, so we crash with
a NULL pointer dereference in this case. Fix it by checking
skb_dst(skb) for NULL after skb_dst_force() and drop the packet
in cast the dst_entry was cleared.

Fixes: 222d7dbd25 ("net: prevent dst uses after free")
Reported-by: Tobias Hommel <netdev-list@genoetigt.de>
Reported-by: Kristian Evensen <kristian.evensen@gmail.com>
Reported-by: Wolfgang Walter <linux@stwm.de>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2018-09-11 11:28:25 +02:00
..
Kconfig Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2017-02-16 21:25:49 -05:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm_algo.c xfrm: use IS_ENABLED() instead of checking for built-in or module 2016-09-10 21:19:11 -07:00
xfrm_device.c xfrm: Register xfrm_dev_notifier in appropriate place 2018-03-30 10:59:23 -04:00
xfrm_hash.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm_hash.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm_input.c xfrm: reset crypto_done when iterating over multiple input xfrms 2018-09-04 10:27:07 +02:00
xfrm_ipcomp.c net: xfrm: use preempt-safe this_cpu_read() in ipcomp_alloc_tfms() 2018-03-13 07:46:37 +01:00
xfrm_output.c xfrm: Fix NULL pointer dereference when skb_dst_force clears the dst_entry. 2018-09-11 11:28:25 +02:00
xfrm_policy.c xfrm: Fix NULL pointer dereference when skb_dst_force clears the dst_entry. 2018-09-11 11:28:25 +02:00
xfrm_proc.c proc: introduce proc_create_net_single 2018-05-16 07:24:30 +02:00
xfrm_replay.c xfrm: Fix ESN sequence number handling for IPsec GSO packets. 2018-03-01 08:14:50 +01:00
xfrm_state.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-05-11 20:53:22 -04:00
xfrm_sysctl.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfrm_user.c xfrm: Validate address prefix lengths in the xfrm selector. 2018-08-03 10:23:07 +02:00