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ath11k: Build check size of ath11k_skb_cb

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It is rather easy to add more entries to ath11k_skb_cb while forgetting the
size limit of ieee80211_tx_info->driver_data. So just check this during the
build to reduce the change of accidental buffer overflow in the skbuff->cb.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201119154235.263250-3-sven@narfation.org
This commit is contained in:
Sven Eckelmann 2020-11-24 17:59:16 +02:00 committed by Kalle Valo
parent 5da7acfec5
commit d35d137549
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wireless/ath/ath11k/core.h
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@ -909,6 +909,8 @@ static inline const char *ath11k_scan_state_str(enum ath11k_scan_state state)
static inline struct ath11k_skb_cb *ATH11K_SKB_CB(struct sk_buff *skb)
{
BUILD_BUG_ON(sizeof(struct ath11k_skb_cb) >
IEEE80211_TX_INFO_DRIVER_DATA_SIZE);
return (struct ath11k_skb_cb *)&IEEE80211_SKB_CB(skb)->driver_data;
}