From: Eric Biggers ebiggers@google.com
[ Upstream commit 8859bf2b1278d064a139e3031451524a49a56bd0 ]
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).
Link: https://lore.kernel.org/r/20200628070057.820213-1-ebiggers@kernel.org Reported-by: syzbot+187510916eb6a14598f7@syzkaller.appspotmail.com Signed-off-by: Eric Biggers ebiggers@google.com Signed-off-by: Jan Kara jack@suse.cz Signed-off-by: Sasha Levin sashal@kernel.org --- 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 897154e993800..f28999f717761 100644 --- a/fs/reiserfs/inode.c +++ b/fs/reiserfs/inode.c @@ -2166,7 +2166,8 @@ 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; }