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 7901C439325; Tue, 21 Jul 2026 21:56:11 +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=1784670973; cv=none; b=RL10EO7T8N2F+otYZJnY2ptlTpJf5G7FYSDtYMXCc9I5QsVjXi3Go8YhZ/m2Ob3Uzzl8KQnq7FUSiGVX8dHkTByVQ6yN+xAa+c7If6MmvsWI+/xuRyl+LdBQ12WLaHApYuc3zhD76rkJQHCkdnusmxXJCjX6wDXbl4h/dZP6DuU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784670973; c=relaxed/simple; bh=GZ9K8woGZ5xEd6wUTv63/jTT24Wyed3APpnre0d1WGA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qtRfnTeXfbdw9gN0aWsZzWkAoYLXWJnAfK7HE8543kCp4XAix3qREEM5r8AyRv5LysLgoIR31vzC1nlmgTYYl1kfGd7JlCFL2DZEAzTd+wQfreZU701Ty026tRLTJ33MZLhjKO+3iAvHGo/l+Lng6AQw6Lf53c55WwkfSPJQTZE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ylMgul1c; 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="ylMgul1c" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DEED81F000E9; Tue, 21 Jul 2026 21:56:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784670971; bh=t5VQPoNad9uK+UwAbOe+dLE3a5hmY41BcGCz758O2fQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=ylMgul1cufa+E0MJpsdNbG6IzH1rELfyzv2/j3Id23GZ5FoRf/GDVBrGoLrpGl/Zg HWQp4/OnWgC6MLjhM2LNx10xVATpPGNklx7XwGIlDHRrpA9WB5aiG7BcIbLNbln2BD ENZs45ICesSDr+let6VQM1gLDiBHoICVv3qYw7Hs= 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 5.15 069/843] ALSA: firewire: isight: bound the sample count to the packet payload Date: Tue, 21 Jul 2026 17:15:04 +0200 Message-ID: <20260721152407.539829022@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@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: 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)