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btrfs: Check name_len in btrfs_check_ref_name_override

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In btrfs_log_inode, btrfs_search_forward gets the buffer and then
btrfs_check_ref_name_override will read name from ref/extref for the
first time.

Call btrfs_is_name_len_valid before reading name.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Su Yue 2017-06-06 17:57:04 +08:00 committed by David Sterba
parent 8ee8c2d62d
commit 3c1d418448
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/tree-log.c
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@ -4562,6 +4562,12 @@ static int btrfs_check_ref_name_override(struct extent_buffer *eb,
this_len = sizeof(*extref) + this_name_len;
}
ret = btrfs_is_name_len_valid(eb, slot, name_ptr,
this_name_len);
if (!ret) {
ret = -EIO;
goto out;
}
if (this_name_len > name_len) {
char *new_name;