From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D982B3A6F0B; Sat, 12 Sep 2026 18:55:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789239343; cv=none; b=Cc/Ne4g8hNONWGVC9bSYCxf3OvpZAuZdkO6KxhRp4JYdd2te729sVSp1S2Qm8n4UlIrEXp3CDwHPh3nnwoBS+kcSjvAMsiM4RKvMm+INyrH+C+wxls0jTnaFmhf0v3SFm02LyaLKMjd4j3lrO0AsbtsHLAn9n/BQhD9Vn43yar8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789239343; c=relaxed/simple; bh=AoRFLGse+JNd50j/a2wsQ1DtNOB0sNzvcWewmw3q2Ho=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YTH+ohjikP+/7cypGYwRflG5v6BTj6V4LBPmtiU3MWjCyIQxW17I+EjogQOFltzRDZhX/rq+/iI0n9qb+ylWCuvLhnqAzLXlVGzKQEo+jOZ52TNUXcMDvjF91G88hy+4/8xyvjrP0r4KVXGiZStHNdldFziH/0Xd5k57pyb7bZg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=s2BLmkT9; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="s2BLmkT9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6D2FE1F00893; Sat, 12 Sep 2026 18:55:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789239341; bh=6Qhh4oe3ia9q6LdWvuV7tf2hIeAVouRFi2brrPyjJbY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=s2BLmkT9d2d0TqvwI4sKMOulZV69Z9xeAB2uTnRlf3DE/18Zr7/7PtSPx8AfIVzYw FbpUg/AvbssYeAFZduX9JgkjYFD5o5+8hl/LWZGDa114k31PSrikahriP2YRk4HJic QhQxg0LysyfqlVj+m3qvvlxPDpR2j++bSF7FCe2o= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Devin Wittmayer , Felix Fietkau , Sasha Levin Subject: [PATCH 5.15 646/935] wifi: mt76: mt76x02: do not WARN on invalid rx descriptor length Date: Sat, 12 Sep 2026 09:01:16 +0200 Message-ID: <20260912065541.659384680@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Devin Wittmayer [ Upstream commit 81497634d9f872fd3e8b03aada55574afff6f174 ] 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 c2d4c8723dbf ("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: 7bc04215a66b ("mt76: add driver code for MT76x2e") Signed-off-by: Devin Wittmayer Link: https://patch.msgid.link/20260613002544.27750-2-lucid_duck@justthetip.ca Signed-off-by: Felix Fietkau Signed-off-by: Sasha Levin --- drivers/net/wireless/mediatek/mt76/mt76x02_mac.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c index eacc5d39d5834..d29d695a433d9 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt76x02_mac.c @@ -850,7 +850,7 @@ 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; pskb_trim(skb, len); -- 2.53.0