[PATCH] locks: fix a memory leak bug

[Wenwen Wang]

In __break_lease(), the file lock 'new_fl' is allocated in lease_alloc().
However, it is not deallocated in the following execution if
smp_load_acquire() fails, leading to a memory leak bug. To fix this issue,
free 'new_fl' before returning the error.

Signed-off-by: Wenwen Wang <wenwen@xxxxxxxxxx>
---
 fs/locks.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/locks.c b/fs/locks.c
index 686eae2..5993b2a 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -1592,7 +1592,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
 	ctx = smp_load_acquire(&inode->i_flctx);
 	if (!ctx) {
 		WARN_ON_ONCE(1);
-		return error;
+		goto free_lock;
 	}
 
 	percpu_down_read(&file_rwsem);
@@ -1672,6 +1672,7 @@ int __break_lease(struct inode *inode, unsigned int mode, unsigned int type)
 	spin_unlock(&ctx->flc_lock);
 	percpu_up_read(&file_rwsem);
 	locks_dispose_list(&dispose);
+free_lock:
 	locks_free_lock(new_fl);
 	return error;
 }
-- 
2.7.4