linux-kernel - Re: [syzbot] [iomap?] [xfs?] WARNING in iomap_write

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Message-Id: <20240902050455.474396-1-sunjunchao2870@gmail.com>
Date: Mon,  2 Sep 2024 13:04:55 +0800
From: Julian Sun <sunjunchao2870@...il.com>
To: syzbot+296b1c84b9cbf306e5a0@...kaller.appspotmail.com
Cc: brauner@...nel.org,
	chandan.babu@...cle.com,
	djwong@...nel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-xfs@...r.kernel.org,
	sunjunchao2870@...il.com,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [iomap?] [xfs?] WARNING in iomap_write_begin

Test the following patch.

#syz test: upstream ee9a43b7cfe2

diff --git a/fs/iomap/iter.c b/fs/iomap/iter.c
index 79a0614eaab7..6e3f6109cac5 100644
--- a/fs/iomap/iter.c
+++ b/fs/iomap/iter.c
@@ -76,7 +76,8 @@ int iomap_iter(struct iomap_iter *iter, const struct iomap_ops *ops)
 	int ret;
 
 	if (iter->iomap.length && ops->iomap_end) {
-		ret = ops->iomap_end(iter->inode, iter->pos, iomap_length(iter),
+		ret = ops->iomap_end(iter->inode, iter->pos,
+				iter->processed > 0 ? iomap_length(iter) : iter->iomap.length,
 				iter->processed > 0 ? iter->processed : 0,
 				iter->flags, &iter->iomap);
 		if (ret < 0 && !iter->processed)