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 BE62B343893; Sat, 12 Sep 2026 12:20:54 +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=1789215656; cv=none; b=gK/6ca0DQKabI1TX9mMnUd9t0X4yBUHuShL3EY0fVnBUwmdAQ4UUIyZg18yCwJg2dnhMhF/OhlPmjU+QlmMfead0hrxM9G/6y2a8UwoS8KwDUEPmtCY18QTPIk0x5n1JkjCQYKjNxw9c3lysN9eeUOSRmB+kWHsrkKuFxUBQ40c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789215656; c=relaxed/simple; bh=9hxJpeLsnGMf/ygWIbRXZ6LviIimhLMilDDm0zN+vbY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=nCco3IDv/J7qT0gQWdXPDXXrgGss0/7cNNFSM/lo342yoxfl/aClvVXLs12wx4VqoR7/R/EaH8XMHGKQclnzP+iA1mjUQ5kkeHGIr+8hz8XvdUSZl+HDA014OUQHdOADacP7pyIzotFLR0uBJHOOzGg8oPpd1zUjiGFn+gVZYXE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=R4EKbdnZ; 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="R4EKbdnZ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3B6351F000FF; Sat, 12 Sep 2026 12:20:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789215654; bh=a3mW6aaqLrrRaIX7RuOp8qRCzDdU+v2lfkVPVqkkSb0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=R4EKbdnZqQbHvYcsVSJY6rDjyKpzDo8pdD6nn72T8jE3K0u2Lud1J/t4T74eSyCE+ dQuiRoCgvKEuFMufgU21KeJg+Szy3EubGR7Q3SazJbNqZSfYwHndE3HPbI/JhRxAqI 2kJgajLsIJrHAQCV5VVmhx3ilBOSFxiYubSlCe/s= 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 6.12 0577/1376] UDF symlink pathComponent header OOB read Date: Sat, 12 Sep 2026 08:50:03 +0200 Message-ID: <20260912065620.390439149@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: 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