linux-kernel - [PATCH 3.18 064/120] ext4: verify the depth of extent tree in ext4_find

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Message-Id: <20181011152552.436933782@linuxfoundation.org>
Date:   Thu, 11 Oct 2018 17:34:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Theodore Tso <tytso@....edu>,
        Ben Hutchings <ben@...adent.org.uk>,
        Greg Hackmann <ghackmann@...gle.com>
Subject: [PATCH 3.18 064/120] ext4: verify the depth of extent tree in ext4_find_extent()

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Theodore Ts'o <tytso@....edu>

commit bc890a60247171294acc0bd67d211fa4b88d40ba upstream.

If there is a corupted file system where the claimed depth of the
extent tree is -1, this can cause a massive buffer overrun leading to
sadness.

This addresses CVE-2018-10877.

https://bugzilla.kernel.org/show_bug.cgi?id=199417

Signed-off-by: Theodore Ts'o <tytso@....edu>
[bwh: Backported to 3.16: return -EIO instead of -EFSCORRUPTED]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Cc: Greg Hackmann <ghackmann@...gle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/ext4/ext4_extents.h |    1 +
 fs/ext4/extents.c      |    6 ++++++
 2 files changed, 7 insertions(+)

--- a/fs/ext4/ext4_extents.h
+++ b/fs/ext4/ext4_extents.h
@@ -103,6 +103,7 @@ struct ext4_extent_header {
 };
 
 #define EXT4_EXT_MAGIC		cpu_to_le16(0xf30a)
+#define EXT4_MAX_EXTENT_DEPTH 5
 
 #define EXT4_EXTENT_TAIL_OFFSET(hdr) \
 	(sizeof(struct ext4_extent_header) + \
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -870,6 +870,12 @@ ext4_find_extent(struct inode *inode, ex
 
 	eh = ext_inode_hdr(inode);
 	depth = ext_depth(inode);
+	if (depth < 0 || depth > EXT4_MAX_EXTENT_DEPTH) {
+		EXT4_ERROR_INODE(inode, "inode has invalid extent depth: %d",
+				 depth);
+		ret = -EIO;
+		goto err;
+	}
 
 	if (path) {
 		ext4_ext_drop_refs(path);