From: Su Yue <suy.fnst@cn.fujitsu.com>
Date: Tue, 6 Jun 2017 09:57:04 +0000 (+0800)
Subject: btrfs: Check name_len in btrfs_check_ref_name_override
X-Git-Tag: v4.13-rc1~150^2~21
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=3c1d41844896f59ac771daf146a5329525dc87c5;p=karo-tx-linux.git

btrfs: Check name_len in btrfs_check_ref_name_override

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>
---

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 06c7ceb07282..f20ef211a73d 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -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;