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* [PATCH] reiserfs: only call unlock_new_inode() if I_NEW
@ 2020-06-28  7:00 Eric Biggers
  2020-07-27 16:52 ` Eric Biggers
  0 siblings, 1 reply; 4+ messages in thread
From: Eric Biggers @ 2020-06-28  7:00 UTC (permalink / raw)
  To: reiserfs-devel, linux-fsdevel; +Cc: linux-kernel, syzbot+187510916eb6a14598f7

From: Eric Biggers <ebiggers@google.com>

unlock_new_inode() is only meant to be called after a new inode has
already been inserted into the hash table.  But reiserfs_new_inode() can
call it even before it has inserted the inode, triggering the WARNING in
unlock_new_inode().  Fix this by only calling unlock_new_inode() if the
inode has the I_NEW flag set, indicating that it's in the table.

This addresses the syzbot report "WARNING in unlock_new_inode"
(https://syzkaller.appspot.com/bug?extid=187510916eb6a14598f7).

Reported-by: syzbot+187510916eb6a14598f7@syzkaller.appspotmail.com
Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 fs/reiserfs/inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 1509775da040..e3af44c61524 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -2163,7 +2163,8 @@ int reiserfs_new_inode(struct reiserfs_transaction_handle *th,
 out_inserted_sd:
 	clear_nlink(inode);
 	th->t_trans_id = 0;	/* so the caller can't use this handle later */
-	unlock_new_inode(inode); /* OK to do even if we hadn't locked it */
+	if (inode->i_state & I_NEW)
+		unlock_new_inode(inode);
 	iput(inode);
 	return err;
 }
-- 
2.27.0


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2020-09-16 18:42 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-06-28  7:00 [PATCH] reiserfs: only call unlock_new_inode() if I_NEW Eric Biggers
2020-07-27 16:52 ` Eric Biggers
2020-09-16  4:01   ` Eric Biggers
2020-09-16 10:54     ` Jan Kara

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