ubifs: Fix memory leak in __ubifs_node_verify_hmac error path

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.

Fixes: 49525e5eecca ("ubifs: Add helper functions for authentication support")
Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
Signed-off-by: Richard Weinberger <richard@nod.at>

diff --git a/fs/ubifs/auth.c b/fs/ubifs/auth.c
index d9af2de9084af584e815da014d77614eae145d41..8cdbd53d780ca76af5d7fb1ee5d670decec07dc6 100644 (file)
--- 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);