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authorMiklos Szeredi <mszeredi@redhat.com>2018-07-26 16:13:11 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2018-07-26 16:13:11 +0200
commit63576c13bd17848376c8ba4a98f5d5151140c4ac (patch)
tree2b33da7010c6d8a18f0736cf80a967a4ce8ad50c /fs/fuse/inode.c
parente8f3bd773d22f488724dffb886a1618da85c2966 (diff)
downloadlinux-63576c13bd17848376c8ba4a98f5d5151140c4ac.tar.bz2
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.c14
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);
}