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mac80211: backport fix for dealing with stripped IV on rx

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This fixes potental rx drop issues

Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Felix Fietkau 2021-11-26 08:40:55 +01:00
parent 3ba9846842
commit 68189835ac
1 changed files with 26 additions and 0 deletions
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package/kernel/mac80211/patches/subsys/307-mac80211-do-not-access-the-IV-when-it-was-stripped.patch Normal file
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@ -0,0 +1,26 @@
From: Xing Song <xing.song@mediatek.com>
Date: Mon, 1 Nov 2021 10:46:57 +0800
Subject: [PATCH] mac80211: do not access the IV when it was stripped
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@mediatek.com>
Link: https://lore.kernel.org/r/20211101024657.143026-1-xing.song@mediatek.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
---
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1952,7 +1952,8 @@ ieee80211_rx_h_decrypt(struct ieee80211_
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);