From: Hillf Danton <hdanton@sina.com>
To: syzbot <syzbot+65d101735df4bb19d2a3@syzkaller.appspotmail.com>
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [fuse?] kernel BUG in fuse_dev_do_write
Date: Sun, 20 Oct 2024 17:39:03 +0800 [thread overview]
Message-ID: <20241020093903.2182-1-hdanton@sina.com> (raw)
In-Reply-To: <6714bb39.050a0220.10f4f4.002e.GAE@google.com>
On Sun, 20 Oct 2024 01:11:37 -0700
> syzbot found the following issue on:
>
> HEAD commit: 15e7d45e786a Add linux-next specific files for 20241016
> git tree: linux-next
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16582f27980000
#syz test
--- x/fs/fuse/dev.c
+++ y/fs/fuse/dev.c
@@ -1668,7 +1668,7 @@ static int fuse_notify_store(struct fuse
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_range(folio, this_num, folio_size(folio) - this_num);
folio_mark_uptodate(folio);
}
folio_unlock(folio);
--
next prev parent reply other threads:[~2024-10-20 9:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-20 8:11 syzbot
2024-10-20 9:39 ` Hillf Danton [this message]
2024-10-20 10:08 ` syzbot
2024-10-21 1:30 ` syzbot
2024-10-21 3:49 ` Hou Tao
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