[PATCH AUTOSEL 5.10 05/28] mac80211: do not access the IV when it was stripped

From: Sasha Levin
Date: Thu Nov 25 2021 - 21:38:12 EST


From: Xing Song <xing.song@xxxxxxxxxxxx>

[ Upstream commit 77dfc2bc0bb4b8376ecd7a430f27a4a8fff6a5a0 ]

ieee80211_get_keyid() will return false value if IV has been stripped,
such as return 0 for IP/ARP frames due to LLC header, and return -EINVAL
for disassociation frames due to its length... etc. Don't try to access
it if it's not present.

Signed-off-by: Xing Song <xing.song@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20211101024657.143026-1-xing.song@xxxxxxxxxxxx
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/mac80211/rx.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index b7979c0bffd0f..6a24431b90095 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1945,7 +1945,8 @@ ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx)
int keyid = rx->sta->ptk_idx;
sta_ptk = rcu_dereference(rx->sta->ptk[keyid]);

- if (ieee80211_has_protected(fc)) {
+ if (ieee80211_has_protected(fc) &&
+ !(status->flag & RX_FLAG_IV_STRIPPED)) {
cs = rx->sta->cipher_scheme;
keyid = ieee80211_get_keyid(rx->skb, cs);

--
2.33.0