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wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV

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When a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two
bss_bcn_cntdwn_tlv entries (the CSA countdown and the CCA-abort BCC), but
MT7996_BEACON_UPDATE_SIZE only reserved one. With MBSSID enabled and a
near-maximum beacon template the extra 8 bytes could push the offload
command past MT7996_MAX_BSS_OFFLOAD_SIZE and trigger skb_over_panic().
Reserve room for both countdown TLVs.

Fixes: 98686cd21624 ("wifi: mt76: mt7996: add driver for MediaTek Wi-Fi 7 (802.11be) devices")
Signed-off-by: Felix Fietkau <[email protected]>
This commit is contained in:
Felix Fietkau
2026-07-24 14:45:39 +02:00
parent f012f82a81
commit f66cff22fb
1 changed files with 1 additions and 1 deletions
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mt7996/mcu.h
+1 -1
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@@ -950,7 +950,7 @@ enum {
#define MT7996_BEACON_UPDATE_SIZE (sizeof(struct bss_req_hdr) + \ #define MT7996_BEACON_UPDATE_SIZE (sizeof(struct bss_req_hdr) + \
sizeof(struct bss_bcn_content_tlv) + \ sizeof(struct bss_bcn_content_tlv) + \
4 + MT_TXD_SIZE + \ 4 + MT_TXD_SIZE + \
sizeof(struct bss_bcn_cntdwn_tlv) + \ sizeof(struct bss_bcn_cntdwn_tlv) * 2 + \
sizeof(struct bss_bcn_mbss_tlv)) sizeof(struct bss_bcn_mbss_tlv))
#define MT7996_MAX_BSS_OFFLOAD_SIZE 2048 #define MT7996_MAX_BSS_OFFLOAD_SIZE 2048
#define MT7996_MAX_BEACON_SIZE (MT7996_MAX_BSS_OFFLOAD_SIZE - \ #define MT7996_MAX_BEACON_SIZE (MT7996_MAX_BSS_OFFLOAD_SIZE - \