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 C4B8C1A8F7B; Sat, 12 Sep 2026 10:06:15 +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=1789207577; cv=none; b=iqCjAhTrK28xYQns6jgjBEFw++UI3edtsVgwj914iW29XtLsnLkDoLUNQuLff8u8ud0H7TbwOI8XR9A2YOa975ZO4r0LyVQWWJ2egl8NT5FFjFwzPEJJnmgCePzzhUrdeuvH4w/SNfBt/ETh2GCe7i/8H0pVLxnv+MCHM2kWA+U= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789207577; c=relaxed/simple; bh=Ai8CXWriGsoWfbmpj2dCqYfy3Cak9q/AOj6FTqrQRoI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TtJwIZBWYHmZzWNn5pVeXxTmyqooa666Hktf8zkDvaeSaRkQhqnCEDbfQF/0fGPCNO1URL/qOfE96NwGgqAZSy9rWx8TlXdr6M4Hq/XVQ3FJ+FeCynFRMDpLDC+wnmFvSBZqgg0SP5AlsdU/re81LY4nHnTRCwzrtZwYG/p40CY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LJEk/EIw; 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="LJEk/EIw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BA9131F000FF; Sat, 12 Sep 2026 10:06:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789207575; bh=2iyH16lXcfuWXP+KEFL8usU7340bzW46Na0vp0J3g5o=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=LJEk/EIwOX5tGvjMwz6uaarHq51WjdBj/q8ZeNyOpGsgrtsuOrH8+3PmQMIHD+8RD /OG7eudpilDs1jTLCXojTjUA4o87g+r+GlduwnMhmGdgPqZQTW8VSYwBpNEpsMR2Sq nB0zJvAXzc2XQGwV/K29oZLXwIxwbwjwEy7HR5io= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, David Lee , Jan Kara , Sasha Levin Subject: [PATCH 6.18 0440/1518] UDF symlink pathComponent header OOB read Date: Sat, 12 Sep 2026 08:43:29 +0200 Message-ID: <20260912065633.403470988@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065623.398859879@linuxfoundation.org> References: <20260912065623.398859879@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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: David Lee [ Upstream commit d23eb7380d1594cda31a5dc8487dd2a5c8def8c7 ] udf_symlink_filler() can enter udf_pc_to_char() with a partial pathComponent header. Validate that enough input remains for a complete pathComponent header before accessing it. Reject malformed symlink data that would otherwise make udf_pc_to_char() perform an out-of-bounds read. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: David Lee Assisted-by: Codex:gpt-5.5 Link: https://patch.msgid.link/20260717104722.41446-1-david.lee@trailofbits.com Signed-off-by: Jan Kara Signed-off-by: Sasha Levin --- fs/udf/symlink.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/udf/symlink.c b/fs/udf/symlink.c index fe03745d09b18..a05d1888a2bab 100644 --- a/fs/udf/symlink.c +++ b/fs/udf/symlink.c @@ -36,6 +36,8 @@ static int udf_pc_to_char(struct super_block *sb, unsigned char *from, /* Reserve one byte for terminating \0 */ tolen--; while (elen < fromlen) { + if (fromlen - elen < sizeof(struct pathComponent)) + return -EIO; pc = (struct pathComponent *)(from + elen); elen += sizeof(struct pathComponent); switch (pc->componentType) { -- 2.53.0