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authorHangyu Hua <hbh25y@gmail.com>2023-05-31 13:28:04 +0300
committerPaolo Abeni <pabeni@redhat.com>2023-06-01 13:59:04 +0300
commit4d56304e5827c8cc8cc18c75343d283af7c4825c (patch)
tree0e37936f1efc7237ca0b9d3ebce6f1d360bb98d5 /net
parent622ab656344a288acf4fb03d628c3bb5dd241f34 (diff)
downloadlinux-4d56304e5827c8cc8cc18c75343d283af7c4825c.tar.xz
net/sched: flower: fix possible OOB write in fl_set_geneve_opt()
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 <hbh25y@gmail.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com> Link: https://lore.kernel.org/r/20230531102805.27090-1-hbh25y@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'net')
-rw-r--r--net/sched/cls_flower.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 9dbc43388e57..815c3e416bc5 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1153,6 +1153,9 @@ static int fl_set_geneve_opt(const struct nlattr *nla, struct fl_flow_key *key,
if (option_len > sizeof(struct geneve_opt))
data_len = option_len - sizeof(struct geneve_opt);
+ if (key->enc_opts.len > FLOW_DIS_TUN_OPTS_MAX - 4)
+ return -ERANGE;
+
opt = (struct geneve_opt *)&key->enc_opts.data[key->enc_opts.len];
memset(opt, 0xff, option_len);
opt->length = data_len / 4;