Re: [PATCH net v2] net/sched: flower: fix possible OOB write in fl_set_geneve_opt()
From: Simon Horman <hidden>
Date: 2023-05-31 15:27:54
Also in:
lkml
On Wed, May 31, 2023 at 06:28:04PM +0800, Hangyu Hua wrote:
If we send two TCA_FLOWER_KEY_ENC_OPTS_GENEVE packets and their total
size is 252 bytes(key->enc_opts.len = 252) then
key->enc_opts.len = opt->length = data_len / 4 = 0 when the third
TCA_FLOWER_KEY_ENC_OPTS_GENEVE packet enters fl_set_geneve_opt. This
bypasses the next bounds check and results in an out-of-bounds.
Fixes: 0a6e77784f49 ("net/sched: allow flower to match tunnel options")
Signed-off-by: Hangyu Hua <redacted>Reviewed-by: Simon Horman <redacted>