github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-10-10 04:18:03 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

wifi: mt76: mt76x02: do not WARN on invalid rx descriptor length

Browse Source 
The MPDU length in the rx descriptor comes from the hardware. In
monitor mode with the fcsfail filter enabled, the hardware passes up
corrupted frames, and a corrupted frame can report a length larger
than the received buffer. The bounds check correctly discards such
frames, but its WARN_ON_ONCE wrapper means any over-the-air garbage
frame taints the kernel, and panics it on the first such frame when
panic_on_warn is set.

Drop the WARN and discard the frame silently, matching what
commit c2d4c8723d ("mt76x2: remove some harmless WARN_ONs in tx
status and rx path") did for the neighboring rx and tx status paths.

Observed immediately on rx with an MT7612U in fcsfail monitor mode
on a busy channel.

Fixes: 7bc04215a6 ("mt76: add driver code for MT76x2e")
Signed-off-by: Devin Wittmayer <lucid_duck@justthetip.ca>
Link: https://patch.msgid.link/20260613002544.27750-2-lucid_duck@justthetip.ca
Signed-off-by: Felix Fietkau <nbd@nbd.name>
This commit is contained in:
Devin Wittmayer 2026-06-12 17:25:43 -07:00 committed by Felix Fietkau
parent 420e0bbd52
commit 81497634d9
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/wireless/mediatek/mt76/mt76x02_mac.c
View File

@ -848,7 +848,7 @@ int mt76x02_mac_process_rx(struct mt76x02_dev *dev, struct sk_buff *skb,
}
}
if (WARN_ON_ONCE(len > skb->len))
if (len > skb->len)
return -EINVAL;
if (pskb_trim(skb, len))