[PATCH 4.4 14/91] ext2: fix potential use after free

From: Greg Kroah-Hartman
Date: Tue Dec 11 2018 - 10:45:30 EST


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

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

From: Pan Bian <bianpan2016@xxxxxxx>

commit ecebf55d27a11538ea84aee0be643dd953f830d5 upstream.

The function ext2_xattr_set calls brelse(bh) to drop the reference count
of bh. After that, bh may be freed. However, following brelse(bh),
it reads bh->b_data via macro HDR(bh). This may result in a
use-after-free bug. This patch moves brelse(bh) after reading field.

CC: stable@xxxxxxxxxxxxxxx
Signed-off-by: Pan Bian <bianpan2016@xxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/ext2/xattr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -605,9 +605,9 @@ skip_replace:
}

cleanup:
- brelse(bh);
if (!(bh && header == HDR(bh)))
kfree(header);
+ brelse(bh);
up_write(&EXT2_I(inode)->xattr_sem);

return error;