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 87C7F28505E; Thu, 16 Jul 2026 14:22:59 +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=1784211780; cv=none; b=OGXRsJxnAiRiGQ8IOM/iO3LOC06TYAQpSdgdpU2za/KpXYmYj/Q95HIJ+ehdjkrva1+BjpcKbk3q5i1yWlzDngxFbjJ1Y5OwAaCZZeJEUKUrVgIm+2S62wD/wJimg8jcs3yiXxr6o6+X79Q7aWaTe5EFYtymAEqjp38WE+yGf10= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784211780; c=relaxed/simple; bh=wKnAfw4hmXab4CTymxQyEi728ujXmspyzSoPoguGO9g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JrbGf61mOZNDML5v3wC/taHtr4vUEbHA39jZyBQAT+d4KDM4BZbyZCkeidnLi+4WIY37GDIwEKHtZzpyvPBI4iTCdieQpSPQQjNoFkLfcX4YV9W6joXUmPCvUScWbHnId4rNWRfreOQkUlyGuEK9kXnVwOhUcfNc7OkfFzfSoMc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bN8CEo22; 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="bN8CEo22" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC3181F000E9; Thu, 16 Jul 2026 14:22:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784211779; bh=c/LMhffAZ6taVfKebxIndwsZZZX/jBQkSMB28+a0ths=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=bN8CEo22uMqjMuUhVeZxpEPecQl5aZliDPsWhyY1GhRY7mecxIx/imXHO1bzMvHMy PEvJai961lRchHCI8JiwYZSYn4EtpPPOjVIh7SeBJOTqIslgjwzLMgQDuNXbYjHK+T 0GEAKpAb9e4nzS2xA1vbCFEc7mmnxBl0aa+MM31w= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Takashi Sakamoto , Maoyi Xie , Takashi Iwai Subject: [PATCH 6.12 077/349] ALSA: firewire: isight: bound the sample count to the packet payload Date: Thu, 16 Jul 2026 15:30:11 +0200 Message-ID: <20260716133035.042973693@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260716133033.287196923@linuxfoundation.org> References: <20260716133033.287196923@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: Maoyi Xie commit 29b9667982e4df2ed7744f86b1144f8bb58eb698 upstream. isight_packet() takes the frame count from the device iso packet and checks it only against the device claimed iso length. count = be32_to_cpu(payload->sample_count); if (likely(count <= (length - 16) / 4)) isight_samples(isight, payload->samples, count); length is the iso header data_length. It can be up to 0xffff. So the gate allows a count up to about 16379. isight_samples() then copies count frames out of payload->samples into the PCM DMA buffer. payload->samples holds only 2 * MAX_FRAMES_PER_PACKET values. The device multiplexes two samples per frame. A count past MAX_FRAMES_PER_PACKET reads past the payload. A count past the buffer size writes past runtime->dma_area. The smallest PCM buffer is larger than MAX_FRAMES_PER_PACKET. Bounding the count to MAX_FRAMES_PER_PACKET keeps both the read and the write in range. A malicious or faulty Apple iSight on the FireWire bus reaches this during a normal capture. Add the MAX_FRAMES_PER_PACKET bound to the gate. Fixes: 3a691b28a0ca ("ALSA: add Apple iSight microphone driver") Suggested-by: Takashi Sakamoto Cc: stable@vger.kernel.org Signed-off-by: Maoyi Xie Link: https://patch.msgid.link/178205454729.1900991.7807310178296762772@maoyixie.com Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/firewire/isight.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/sound/firewire/isight.c +++ b/sound/firewire/isight.c @@ -179,7 +179,8 @@ static void isight_packet(struct fw_iso_ if (likely(length >= 16 && payload->signature == cpu_to_be32(0x73676874/*"sght"*/))) { count = be32_to_cpu(payload->sample_count); - if (likely(count <= (length - 16) / 4)) { + if (likely(count <= (length - 16) / 4 && + count <= MAX_FRAMES_PER_PACKET)) { total = be32_to_cpu(payload->sample_total); if (unlikely(total != isight->total_samples)) { if (!isight->first_packet)