Re: [syzbot] [ntfs3?] WARNING in indx_insert_into_buffer

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@xxxxxxxxxxxxxxx.

***

Subject: [ntfs3?] WARNING in indx_insert_into_buffer
Author: lizhi.xu@xxxxxxxxxxxxx

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 037266a5f723

diff --git a/fs/ntfs3/index.c b/fs/ntfs3/index.c
index cf92b2433f7a..a2fe5458d41c 100644
--- a/fs/ntfs3/index.c
+++ b/fs/ntfs3/index.c
@@ -1905,6 +1905,8 @@ indx_insert_into_buffer(struct ntfs_index *indx, struct ntfs_inode *ni,
 	}
 
 	if (err) {
+		if (used1 > le32_to_cpu(hdr1->used))
+			used1 = le32_to_cpu(hdr1->used);
 		/*
 		 * Undo critical operations.
 		 */