[PATCH 4.9 007/245] ntfs: fix validity check for file name attribute

From: Greg Kroah-Hartman
Date: Mon Jul 19 2021 - 11:08:00 EST

From: Desmond Cheong Zhi Xi <desmondcheongzx@xxxxxxxxx>

commit d98e4d95411bbde2220a7afa38dcc9c14d71acbe upstream.

When checking the file name attribute, we want to ensure that it fits
within the bounds of ATTR_RECORD. To do this, we should check that (attr
record + file name offset + file name length) < (attr record + attr record

However, the original check did not include the file name offset in the
calculation. This means that corrupted on-disk metadata might not caught
by the incorrect file name check, and lead to an invalid memory access.

An example can be seen in the crash report of a memory corruption error
found by Syzbot:

Adding the file name offset to the validity check fixes this error and
passes the Syzbot reproducer test.

Link: https://lkml.kernel.org/r/20210614050540.289494-1-desmondcheongzx@xxxxxxxxx
Signed-off-by: Desmond Cheong Zhi Xi <desmondcheongzx@xxxxxxxxx>
Reported-by: syzbot+213ac8bb98f7f4420840@xxxxxxxxxxxxxxxxxxxxxxxxx
Tested-by: syzbot+213ac8bb98f7f4420840@xxxxxxxxxxxxxxxxxxxxxxxxx
Acked-by: Anton Altaparmakov <anton@xxxxxxxxxx>
Cc: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -502,7 +502,7 @@ err_corrupt_attr:
file_name_attr = (FILE_NAME_ATTR*)((u8*)attr +
- p2 = (u8*)attr + le32_to_cpu(attr->data.resident.value_length);
+ p2 = (u8 *)file_name_attr + le32_to_cpu(attr->data.resident.value_length);
if (p2 < (u8*)attr || p2 > p)
goto err_corrupt_attr;
/* This attribute is ok, but is it in the $Extend directory? */