linux-kernel - Re: [syzbot] [f2fs?] kernel BUG in f2fs_write_inline

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Message-Id: <20240602114905.1462-1-hdanton@sina.com>
Date: Sun,  2 Jun 2024 19:49:05 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+848062ba19c8782ca5c8@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [f2fs?] kernel BUG in f2fs_write_inline_data

On Sat, 01 Jun 2024 04:50:27 -0700
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    0e1980c40b6e Add linux-next specific files for 20240531
> git tree:       linux-next
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14d86426980000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git  master

--- x/fs/f2fs/data.c
+++ y/fs/f2fs/data.c
@@ -2854,7 +2854,7 @@ write:
 		set_inode_flag(inode, FI_HOT_DATA);
 
 	err = -EAGAIN;
-	if (f2fs_has_inline_data(inode)) {
+	if (f2fs_has_inline_data(inode) && !page->index) {
 		err = f2fs_write_inline_data(inode, page);
 		if (!err)
 			goto out;
--