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 77FB737E5D1; Sat, 12 Sep 2026 12:39:00 +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=1789216741; cv=none; b=u4gexQ7WgvlNo2EttZA+ZvQwPS6pP34G7tQfZ37YLNnhheZQ4Dr1HchhoNmhyHj4OVCH/WRQ6UhjrC+GwP94UYgGPXZURs/qRVNBjsdRCXQBxJWUrKheghWtclHuov8XyJZ64xl3XWH4G0TnTgPNSv9cmcCIn5y9Zvs+zrJL2D8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789216741; c=relaxed/simple; bh=XeJPkWY8Ff234bgVewAhuh6Y/BG1T6mZTqZp9BpE3Uc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LMpIPB1p4fEMp7oiwgOWpojB/yYeb4wDVABfqrF1rEwQFgIiEcXOBzNplNxUr21CQQZa8M1xppRomtmCZxBb+IDnFAVY/LV3vx2KNLijUQeoQJy6MOCIZAwfpNmqI4n9/aQHhJhXOlTLYWsZsCnzuxASjObsNfb9oYL7a3l31Hs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=w0q4LItz; 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="w0q4LItz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4ACA31F00893; Sat, 12 Sep 2026 12:38:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789216740; bh=rNC/+GM+lYdu/Gq28iZ08onncq13F0zJbYJf/zto2vE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=w0q4LItzhsjXXWlQPXDxMv7/aEQfaEgu1wSRDk2a0B8lVICBx9eOlzS5l9Taopu10 Rb5XBrZQCGLwrF4NWjgj9xC9gJgmJwrD/6NSoutHOMYN3UpTnG6102TIsJgKXDYarl aTVkK6JnKKCFsIE0268FpXxt3Xo3+pdY1tKlOHgw= 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 6.12 0799/1376] wifi: mt76: mt76x02: do not WARN on invalid rx descriptor length Date: Sat, 12 Sep 2026 08:53:45 +0200 Message-ID: <20260912065625.342049402@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.535295758@linuxfoundation.org> References: <20260912065607.535295758@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 6.12-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 d5db6ffd6d365..338f5b46c6511 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; if (pskb_trim(skb, len)) -- 2.53.0