orangefs: Fix sb refcount leak when allocate sb info failed.

The reference counting issue happens in one exception handling
path of orangefs_mount(). When failing to allocate sb info, the
function forgets to decrease the refcount of sb increased by
sget(), causing a refcount leak.

Fix this issue by jumping to the label "free_sb_and_op" instead
of "free_op"

Signed-off-by: Chenyuan Mi <cymi20@fudan.edu.cn>
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>

diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c
index 897fb6c..18341cd 100644 (file)
--- a/fs/orangefs/super.c
+++ b/fs/orangefs/super.c
@@ -526,7 +526,7 @@ struct dentry *orangefs_mount(struct file_system_type *fst,
        sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
        if (!ORANGEFS_SB(sb)) {
                d = ERR_PTR(-ENOMEM);
-               goto free_op;
+               goto free_sb_and_op;
        }
 
        ret = orangefs_fill_sb(sb,