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authorTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>2023-01-02 23:05:33 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2023-01-02 10:31:09 -0800
commit0226635c304cfd5c9db9b78c259cb713819b057e (patch)
treed953d1f6de947ca0a6e29ddedfbbcaa16afa2bfd /fs/ntfs3
parent88603b6dc419445847923fcb7fe5080067a30f98 (diff)
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')
-rw-r--r--fs/ntfs3/file.c4
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);