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| author | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-26 16:13:11 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-26 16:13:11 +0200 |
| commit | 63576c13bd17848376c8ba4a98f5d5151140c4ac (patch) | |
| tree | 2b33da7010c6d8a18f0736cf80a967a4ce8ad50c /fs/fuse/inode.c | |
| parent | e8f3bd773d22f488724dffb886a1618da85c2966 (diff) | |
| download | linux-stable-63576c13bd17848376c8ba4a98f5d5151140c4ac.tar.gz linux-stable-63576c13bd17848376c8ba4a98f5d5151140c4ac.tar.bz2 linux-stable-63576c13bd17848376c8ba4a98f5d5151140c4ac.zip | |
fuse: fix initial parallel dirops
If parallel dirops are enabled in FUSE_INIT reply, then first operation may
leave fi->mutex held.
Reported-by: syzbot <syzbot+3f7b29af1baa9d0a55be@syzkaller.appspotmail.com>
Fixes: 5c672ab3f0ee ("fuse: serialize dirops by default")
Cc: <stable@vger.kernel.org> # v4.7
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/inode.c')
| -rw-r--r-- | fs/fuse/inode.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 0115c2f0a428..2dbd487390a3 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -357,15 +357,21 @@ int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid, return 0; } -void fuse_lock_inode(struct inode *inode) +bool fuse_lock_inode(struct inode *inode) { - if (!get_fuse_conn(inode)->parallel_dirops) + bool locked = false; + + if (!get_fuse_conn(inode)->parallel_dirops) { mutex_lock(&get_fuse_inode(inode)->mutex); + locked = true; + } + + return locked; } -void fuse_unlock_inode(struct inode *inode) +void fuse_unlock_inode(struct inode *inode, bool locked) { - if (!get_fuse_conn(inode)->parallel_dirops) + if (locked) mutex_unlock(&get_fuse_inode(inode)->mutex); } |