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wifi: mac80211: fix encryption tailroom

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BIP-CMAC-256 and BIP-GMAC append a 26-byte MME but mac80211
currently reserves only 18 bytes of encryption tailroom.

Generating 26-byte MME may happen to work because the actual skb
tailroom can exceed the requested amount. For example, dev_alloc_skb()
rounds the allocation to kmalloc size buckets or alignment boundaries,
and the extra space may cover the 8-byte shortfall.

Reserve enough tailroom for the 26-byte MME.

Fixes: 56c52da2d5 ("mac80111: Add BIP-CMAC-256 cipher")
Signed-off-by: Chien Wong <m@xv97.com>
Link: https://patch.msgid.link/20261012140738.70178-2-m@xv97.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Chien Wong 2026-10-12 22:07:36 +08:00 committed by Johannes Berg
parent 1a82eea843
commit c49f54fd2a
1 changed files with 1 additions and 1 deletions
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2
net/mac80211/ieee80211_i.h
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@ -52,7 +52,7 @@ struct ieee80211_mesh_fast_tx;
/* Required encryption head and tailroom */
#define IEEE80211_ENCRYPT_HEADROOM 8
#define IEEE80211_ENCRYPT_TAILROOM 18
#define IEEE80211_ENCRYPT_TAILROOM 26 /* current max: GMAC/CMAC-256 MME */
/* power level hasn't been configured (or set to automatic) */
#define IEEE80211_UNSET_POWER_LEVEL INT_MIN