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ubifs: fix a memory leak bug

Message ID 1566271490-8533-1-git-send-email-wenwen@cs.uga.edu
State Accepted
Headers show
Series ubifs: fix a memory leak bug | expand

Commit Message

Wenwen Wang Aug. 20, 2019, 3:24 a.m. UTC 
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 <wenwen@cs.uga.edu>
---
 fs/ubifs/auth.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
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Patch

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);