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rtlwifi: rtl_pci: Fix problem of too small skb->len

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In commit 8020919a9b ("mac80211: Properly handle SKB with radiotap
only"), buffers whose length is too short cause a WARN_ON(1) to be
executed. This change exposed a fault in rtlwifi drivers, which is fixed
by regarding packets with skb->len <= FCS_LEN as though they are in error
and dropping them. The test is now annotated as likely.

Cc: Stable <stable@vger.kernel.org> # v5.0+
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Larry Finger 2019-10-20 19:56:58 -05:00 committed by Kalle Valo
parent 17c216ed6b
commit b43f4a169f
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wireless/realtek/rtlwifi/pci.c
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@ -822,7 +822,7 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
hdr = rtl_get_hdr(skb);
fc = rtl_get_fc(skb);
if (!stats.crc && !stats.hwerror) {
if (!stats.crc && !stats.hwerror && (skb->len > FCS_LEN)) {
memcpy(IEEE80211_SKB_RXCB(skb), &rx_status,
sizeof(rx_status));
@ -859,6 +859,7 @@ static void _rtl_pci_rx_interrupt(struct ieee80211_hw *hw)
_rtl_pci_rx_to_mac80211(hw, skb, rx_status);
}
} else {
/* drop packets with errors or those too short */
dev_kfree_skb_any(skb);
}
new_trx_end: