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 7533438656D; Sat, 12 Sep 2026 18:55:56 +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=1789239357; cv=none; b=lcge/FIKsliilcBVfqWSViWI9swYbaulXXpBMiWFf2B1iTlj1pXJ47B4t7LzLHxUUZC069qLpLrX+OBHO7wnxcepnhesTF4DFcPsUyRocfKoPi4AiHpKIQdrEO48NAhSO484Jf38tK5ix1sJUNouHYLhrZYvmMf5VINNdLVzytQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789239357; c=relaxed/simple; bh=tr+MbfHuny4fG2GueotFwm3kgiGpE7SffefpTc4tuSA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=s//8yhwZ0eS4blRljYnhBdMKCUai9+ZXLvoI2qcq5fYGiRBj69vs9csevwxVPByosVtfvhcfPk7Kq9FbxPQhukFIuVwbWpMan3OY4W7sPozBRCKP45tETLfSmvdtGpz8663yZz572MEnQsuC6PykYET07glrPiLj1lzhS0VcwY8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=a2+gHWdq; 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="a2+gHWdq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 170CA1F000FF; Sat, 12 Sep 2026 18:55:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789239356; bh=XVZXCdsisK+GgKiLdDyX9x/bd4nf3Fi9vkhJVThM9Sc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=a2+gHWdqU9Nt4M1DRY27ETdFJqC8yNjTxvDndPuW4GHeGAfB9Qjfs0rkKR7rOQ51v /T4pRNFuxhhQlZ6iv7HKDtYtO1ijPQnjv1uzY+wwi4MJqDYF/YaLKM3MrvEjf335qa XDgCL0KJsfWgdg22ATr177JuxRdlkcU/4OweG7Mc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Felix Fietkau , Sasha Levin Subject: [PATCH 5.15 648/935] wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss Date: Sat, 12 Sep 2026 09:01:18 +0200 Message-ID: <20260912065541.704801319@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: 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 169055261e9b9..1d7f136ad0812 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c @@ -206,7 +206,7 @@ mt7915_mcu_get_sta_nss(u16 mcs_map) break; } - return nss - 1; + return nss ? nss - 1 : 0; } static void -- 2.53.0