Antoine Tenart d75abeec40 tunnels: fix out of bounds access when building IPv6 PMTU error
If the ICMPv6 error is built from a non-linear skb we get the following
splat,

  BUG: KASAN: slab-out-of-bounds in do_csum+0x220/0x240
  Read of size 4 at addr ffff88811d402c80 by task netperf/820
  CPU: 0 PID: 820 Comm: netperf Not tainted 6.8.0-rc1+ #543
  ...
   kasan_report+0xd8/0x110
   do_csum+0x220/0x240
   csum_partial+0xc/0x20
   skb_tunnel_check_pmtu+0xeb9/0x3280
   vxlan_xmit_one+0x14c2/0x4080
   vxlan_xmit+0xf61/0x5c00
   dev_hard_start_xmit+0xfb/0x510
   __dev_queue_xmit+0x7cd/0x32a0
   br_dev_queue_push_xmit+0x39d/0x6a0

Use skb_checksum instead of csum_partial who cannot deal with non-linear
SKBs.

Fixes: 4cb47a8644cc ("tunnels: PMTU discovery support for directly bridged IP packets")
Signed-off-by: Antoine Tenart <atenart@kernel.org>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2024-02-03 12:43:19 +00:00
..
2023-10-01 19:09:54 +01:00
2024-01-18 11:37:24 -08:00
2023-12-15 16:25:55 -08:00
2023-12-26 20:31:01 +00:00
2024-01-11 10:07:29 -08:00
2023-12-29 07:46:38 +00:00
2024-01-03 18:37:22 -08:00
2024-01-23 08:38:13 -08:00
2024-01-04 10:29:18 +00:00
2024-01-23 08:38:13 -08:00
2023-12-26 20:31:01 +00:00
2023-12-12 14:24:14 +01:00
2024-01-04 10:23:10 -08:00
2024-01-04 10:23:10 -08:00
2024-01-08 11:43:04 -08:00