linux-kernel - [PATCH] fuse: zero folio correctly in fuse_notify

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Message-Id: <20241021125955.2443353-1-houtao@huaweicloud.com>
Date: Mon, 21 Oct 2024 20:59:55 +0800
From: Hou Tao <houtao@...weicloud.com>
To: linux-fsdevel@...r.kernel.org
Cc: Miklos Szeredi <miklos@...redi.hu>,
	Josef Bacik <josef@...icpanda.com>,
	linux-kernel@...r.kernel.org,
	houtao1@...wei.com
Subject: [PATCH] fuse: zero folio correctly in fuse_notify_store()

From: Hou Tao <houtao1@...wei.com>

The third argument of folio_zero_range() should be the length to be
zeroed, not the total length. Fix it by using folio_zero_segment()
instead in fuse_notify_store().

Reported-by: syzbot+65d101735df4bb19d2a3@...kaller.appspotmail.com
Fixes: 5d9e1455630d ("fuse: convert fuse_notify_store to use folios")
Signed-off-by: Hou Tao <houtao1@...wei.com>
---
 fs/fuse/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 824e329b8fd7..eb89a301c406 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1668,7 +1668,7 @@ static int fuse_notify_store(struct fuse_conn *fc, unsigned int size,
 		err = fuse_copy_page(cs, &page, offset, this_num, 0);
 		if (!folio_test_uptodate(folio) && !err && offset == 0 &&
 		    (this_num == folio_size(folio) || file_size == end)) {
-			folio_zero_range(folio, this_num, folio_size(folio));
+			folio_zero_segment(folio, this_num, folio_size(folio));
 			folio_mark_uptodate(folio);
 		}
 		folio_unlock(folio);
-- 
2.29.2