[PATCH] ubifs: fix a memory leak bug

[Wenwen Wang]

In __ubifs_node_verify_hmac(), 'hmac' is allocated through kmalloc().
However, it is not deallocated in the following execution if
ubifs_node_calc_hmac() fails, leading to a memory leak bug. To fix this
issue, free 'hmac' before returning the error.

Signed-off-by: Wenwen Wang <wen...@cs.uga.edu>
---
 fs/ubifs/auth.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ubifs/auth.c b/fs/ubifs/auth.c
index d9af2de..8cdbd53 100644
--- a/fs/ubifs/auth.c
+++ b/fs/ubifs/auth.c
@@ -479,8 +479,10 @@ int __ubifs_node_verify_hmac(const struct ubifs_info *c, 
const void *node,
                return -ENOMEM;
 
        err = ubifs_node_calc_hmac(c, node, len, ofs_hmac, hmac);
-       if (err)
+       if (err) {
+               kfree(hmac);
                return err;
+       }
 
        err = crypto_memneq(hmac, node + ofs_hmac, hmac_len);
 
-- 
2.7.4