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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2023-01-02 23:05:33 +0900 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-01-02 10:31:09 -0800 |
| commit | 0226635c304cfd5c9db9b78c259cb713819b057e (patch) | |
| tree | d953d1f6de947ca0a6e29ddedfbbcaa16afa2bfd /fs/ntfs3/file.c | |
| parent | 88603b6dc419445847923fcb7fe5080067a30f98 (diff) | |
| download | linux-0226635c304cfd5c9db9b78c259cb713819b057e.tar.bz2 | |
fs/ntfs3: don't hold ni_lock when calling truncate_setsize()
syzbot is reporting hung task at do_user_addr_fault() [1], for there is
a silent deadlock between PG_locked bit and ni_lock lock.
Since filemap_update_page() calls filemap_read_folio() after calling
folio_trylock() which will set PG_locked bit, ntfs_truncate() must not
call truncate_setsize() which will wait for PG_locked bit to be cleared
when holding ni_lock lock.
Link: https://lore.kernel.org/all/00000000000060d41f05f139aa44@google.com/
Link: https://syzkaller.appspot.com/bug?extid=bed15dbf10294aa4f2ae [1]
Reported-by: syzbot <syzbot+bed15dbf10294aa4f2ae@syzkaller.appspotmail.com>
Debugged-by: Linus Torvalds <torvalds@linux-foundation.org>
Co-developed-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Hillf Danton <hdanton@sina.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Fixes: 4342306f0f0d ("fs/ntfs3: Add file operations and implementation")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ntfs3/file.c')
| -rw-r--r-- | fs/ntfs3/file.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c index e5399ebc3a2b..d294cd975688 100644 --- a/fs/ntfs3/file.c +++ b/fs/ntfs3/file.c @@ -390,10 +390,10 @@ static int ntfs_truncate(struct inode *inode, loff_t new_size) new_valid = ntfs_up_block(sb, min_t(u64, ni->i_valid, new_size)); - ni_lock(ni); - truncate_setsize(inode, new_size); + ni_lock(ni); + down_write(&ni->file.run_lock); err = attr_set_size(ni, ATTR_DATA, NULL, 0, &ni->file.run, new_size, &new_valid, ni->mi.sbi->options->prealloc, NULL); |