In commit 8020919a9b99 ("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 increasing the length of the affected buffer before it is sent to
mac80211.
Cc: Stable <stable@xxxxxxxxxxxxxxx> # v5.0+
Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
---
Kalle,
Please send to v5.4.
Larry
---
drivers/net/wireless/realtek/rtlwifi/pci.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/wireless/realtek/rtlwifi/pci.c b/drivers/net/wireless/realtek/rtlwifi/pci.c
index 6087ec7a90a6..bb5144b7c64f 100644
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -692,7 +692,10 @@ static void _rtl_pci_rx_to_mac80211(struct ieee80211_hw *hw,
dev_kfree_skb_any(skb);
} else {
struct sk_buff *uskb = NULL;
+ int len = skb->len;
+ if (unlikely(len <= FCS_LEN))
+ len = FCS_LEN + 2;
uskb = dev_alloc_skb(skb->len + 128);
if (likely(uskb)) {
memcpy(IEEE80211_SKB_RXCB(uskb), &rx_status,
--
2.23.0
