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 9F4543093A6; Sat, 12 Sep 2026 14:30:48 +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=1789223449; cv=none; b=Bn68oHsynn2RkAugq/y7S3OeHfcmcDaGsTt4qfC/qTR/OEb0qq9DCVyAqOBg2FQUxe21ZIv4eqFuQO74qPDg1I4ss/bmlzpcxX7+1HzvgJnBL4f3iFC7ReqYsqjD6MAgARsZCXryTBe58U7S84NdHqPPVMOnnbKBSZoWfY5Vny0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789223449; c=relaxed/simple; bh=G7mN6bQFgdMVSQxt5V3YzqjiHZSQkcF7dNK+pVKWhBI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=a7Yr57P216S6fIy/qZWHMMeQE6k5eZQ3P6nljdQuY7SSya+C6+jWlvAu21obh5rnq5ud1/1LdBHlH++aSM3cIN3kPZ1iIO/ajK4J/FEs6Qf41Ll8rb1AAgKm5NVT7om6dpRxbTrRlJ60EbwZGZftimEgm7yDsaZkHmcyk3HI7Ro= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=psiG9bdy; 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="psiG9bdy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 593E71F000FF; Sat, 12 Sep 2026 14:30:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789223448; bh=3RnyR80r4YO796CeDpiQn+EG7wwB2FDAP9fji9Eknac=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=psiG9bdyS/YaN8aMQtS3IrRh8Y4J4uXDqkbr9jD9QtwEg7Hyx5oY1/OghO9du3Qq7 KO5zxg3vkLwrJotYhnLR5f/E1Mfnfj05decCtXrQ27+9pnbqRFT2D9ML9vK9In89Qp wNp5Q5CGHFcNiLU0wWMypqzlBPKftz3X/e6QbLzE= 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 6.6 0792/1424] UDF symlink pathComponent header OOB read Date: Sat, 12 Sep 2026 08:53:44 +0200 Message-ID: <20260912065625.035186010@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.279695368@linuxfoundation.org> References: <20260912065607.279695368@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 6.6-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 f7eaf7b145940..ee78403bf7c9d 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