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 36C692F60B2; Sat, 12 Sep 2026 14:45:43 +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=1789224344; cv=none; b=HS7nkHaxsFxr2bbZo8A4aj4P8LAOnq1xbFsoQDC3XGRlCIpCike8KkNg2SRne+RXSHbvinriy3zs+eBAaGw2T1uW6GLAwt+9We7OjDYH/1lUF2W5iQx/J1MDMD9w/uzcH5kB1QWJB6N7bS+VT4U2+nollZncH6VMmxgN35QDyIk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789224344; c=relaxed/simple; bh=4SNOkmW1jhw4GwcG4/GaPZ4wt7tvf2fwuUZ8F8mjFKA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FWjRQunQJXA7xD4WPnYkr+7jE/L5hSimQLHvy/ZgIVpl3obVOZDT9s+UCQJT0APk57LOt8gvyBcYwegxKTaVBJ9V1d1rmt7FwtFUG8soD9CAtap3CuVfuWJAUTm6gfshq5UrY0Xt23dPUelbbVSNKZwsW7B3pRM8TLG/ut+XQOw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=KbyzntRK; 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="KbyzntRK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B6571F000FF; Sat, 12 Sep 2026 14:45:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789224343; bh=vGJ2h3AYVT6plIY2wALiEge6FUPl6NnQeusHFT4GrcA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=KbyzntRK/BVMfNwBj9rjYwjppy1TKZp0uRkEMp/MdkJOPqDVEcjW3lD0Pv3EoYnR8 qcomNqDNi7WcNRKLSpzTMfY/4SuiRdNwq4jV9bfpBSidPK8c+EBkLkDBW9Th5wsKUW 0VxOx7ayH6YzQwBDNzH05A6GawGBdHM2dEfDCRIg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Felix Fietkau , Sasha Levin Subject: [PATCH 6.6 0974/1424] wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss Date: Sat, 12 Sep 2026 08:56:46 +0200 Message-ID: <20260912065629.126421493@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.279695368@linuxfoundation.org> References: <20260912065607.279695368@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 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Felix Fietkau [ Upstream commit 4a2f4be532e3ea4e2b536e411793a05aaa51af25 ] If a peer's VHT/HE MCS map has no supported spatial stream (all fields 0x3), the loop exits with nss == 0 and the function returned (u8)-1 (255), which was then written into the firmware sta_rec_bf beamforming fields. Clamp the result to 0. Fixes: 89029a85482c ("mt76: mt7915: add Tx beamformer support") Link: https://patch.msgid.link/20260722082610.2699628-9-nbd@nbd.name Signed-off-by: Felix Fietkau Signed-off-by: Sasha Levin --- drivers/net/wireless/mediatek/mt76/mt7915/mcu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c index 9ac95f14fdaf9..45a0dedbf022d 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c @@ -51,7 +51,7 @@ mt7915_mcu_get_sta_nss(u16 mcs_map) break; } - return nss - 1; + return nss ? nss - 1 : 0; } static void -- 2.53.0