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 BC31247A0D7; Sat, 12 Sep 2026 11:50:55 +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=1789213857; cv=none; b=twtKmeYOK6hqSldCQe0tElmIKC/bC3NjRs9KzosPqri0aWSqKPmOYZNwkFet7ChLylW++dFNOmthUASEsHWoWCzMeusg3DOp8r0n+TACed8CFT6zrZD/A0NF6HsWHUvAen5FXl1QDolmtCZp3F/K1EryqHRT18iMSFwZuaWpHhk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789213857; c=relaxed/simple; bh=KNo3tGgWCnvHQ7xj4FkYaqlEF9P1y7Xnt0MSESoRscI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Xam9UykqX7TmuzsGf70Gpcn7mmuNlomLG4dOlAZx4rZ7JxJUbzKWYxfC5jjGrvzzwMSttRAi2WKom1s3bh5nEg6uFH84oXKcKUpsKHgwg6bdMfOfwLHMDu7g3HWz/7u0L7iwldqRixeHQSjjPyKoR5kqcrwUGbK9YC8/QPtNWgY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2OX2qdwT; 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="2OX2qdwT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A778C1F000FF; Sat, 12 Sep 2026 11:50:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789213855; bh=B4hQNU1cTNF84pboIxrJCcbYJpJJejccyNRKBvR1YDo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=2OX2qdwT8WWyeDgP+5QO7cyGyFzctaVPSRV5dQTm0kVZNH12K0S6SwhaabQNV5gX+ 2VSHkErjr9jSmxDKB1ivj1juiaj8I+HC6E/rCP2Xtc4G5cq+3wU6gasAptdnWr3HhD 3iJ68+8A586MIGgmYb/F5omnBkGqc/QRd0qHZT+U= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, HyeongJun An , Hans Verkuil Subject: [PATCH 6.12 0207/1376] media: s2255: bound JPEG frame size before copying into the buffer Date: Sat, 12 Sep 2026 08:43:53 +0200 Message-ID: <20260912065612.163552365@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: HyeongJun An commit e504cc888f42999dd76b6a43788c422610f2aad2 upstream. s2255_fillbuff() memcpy()s vc->jpg_size bytes of a captured JPEG/MJPEG frame into the vb2 plane. vc->jpg_size is taken verbatim from the S2255_MARKER_FRAME header the device sends (pdword[4] in save_frame()) and, unlike the frame payload length just above it, is never bounded: payload = le32_to_cpu(pdword[3]); if (payload > vc->req_image_size) /* payload is checked ... */ return -EINVAL; vc->pkt_size = payload; vc->jpg_size = le32_to_cpu(pdword[4]); /* ... jpg_size is not */ A malicious or malfunctioning device can therefore report a jpg_size larger than the destination vb2 plane, and the memcpy() writes past it. jpg_size is a signed int, so a value with the top bit set also turns into a huge length. Reject a frame whose jpg_size is negative or exceeds the plane size before copying it. Fixes: 38f993ad8b1f ("V4L/DVB (8125): This driver adds support for the Sensoray 2255 devices.") Cc: stable@vger.kernel.org Assisted-by: Claude:claude-opus-4-8 Signed-off-by: HyeongJun An Signed-off-by: Hans Verkuil Signed-off-by: Greg Kroah-Hartman --- drivers/media/usb/s2255/s2255drv.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/media/usb/s2255/s2255drv.c +++ b/drivers/media/usb/s2255/s2255drv.c @@ -617,6 +617,12 @@ static void s2255_fillbuff(struct s2255_ break; case V4L2_PIX_FMT_JPEG: case V4L2_PIX_FMT_MJPEG: + if (jpgsize < 0 || + jpgsize > vb2_plane_size(&buf->vb.vb2_buf, 0)) { + dprintk(dev, 1, "bad JPEG frame size %d\n", + jpgsize); + break; + } vb2_set_plane_payload(&buf->vb.vb2_buf, 0, jpgsize); memcpy(vbuf, tmpbuf, jpgsize); break;