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| author | David Ahern <dsa@cumulusnetworks.com> | 2017-03-06 16:53:04 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-22 11:43:33 (GMT) |
| commit | db6e7796186a8d9a41e9d14b4a824c9cb80aaaf4 (patch) | |
| tree | a67100f620a74cc7a1fa12bae818eba472336404 /net/ipv4 | |
| parent | 7c0eaeec84d14d4b85773ccac8bffe8b2eafea7c (diff) | |
| download | linux-db6e7796186a8d9a41e9d14b4a824c9cb80aaaf4.tar.xz | |
vrf: Fix use-after-free in vrf_xmit
[ Upstream commit f7887d40e541f74402df0684a1463c0a0bb68c68 ]
KASAN detected a use-after-free:
[ 269.467067] BUG: KASAN: use-after-free in vrf_xmit+0x7f1/0x827 [vrf] at addr ffff8800350a21c0
[ 269.467067] Read of size 4 by task ssh/1879
[ 269.467067] CPU: 1 PID: 1879 Comm: ssh Not tainted 4.10.0+ #249
[ 269.467067] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 269.467067] Call Trace:
[ 269.467067] dump_stack+0x81/0xb6
[ 269.467067] kasan_object_err+0x21/0x78
[ 269.467067] kasan_report+0x2f7/0x450
[ 269.467067] ? vrf_xmit+0x7f1/0x827 [vrf]
[ 269.467067] ? ip_output+0xa4/0xdb
[ 269.467067] __asan_load4+0x6b/0x6d
[ 269.467067] vrf_xmit+0x7f1/0x827 [vrf]
...
Which corresponds to the skb access after xmit handling. Fix by saving
skb->len and using the saved value to update stats.
Fixes: 193125dbd8eb2 ("net: Introduce VRF device driver")
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4')
0 files changed, 0 insertions, 0 deletions