diff --git a/grsecurity/grsum.c b/grsecurity/grsum.c
index 9f7b1ac..67d6be1 100644
--- a/grsecurity/grsum.c
+++ b/grsecurity/grsum.c
@@ -36,14 +36,15 @@ chkpw(struct gr_arg *entry, unsigned char *salt, unsigned char *sum)
 
 	crypto_hash_init(&desc);
 
-	p = salt;
+	p = kmemdup(salt, GR_SALT_LEN, GFP_KERNEL);
 	sg_set_buf(&sg, p, GR_SALT_LEN);
 	crypto_hash_update(&desc, &sg, sg.length);
+	kfree(p);
 
-	p = entry->pw;
+	p = kmemdup(entry->pw, strlen(entry->pw), GFP_KERNEL);
 	sg_set_buf(&sg, p, strlen(p));
-	
 	crypto_hash_update(&desc, &sg, sg.length);
+	kfree(p);
 
 	crypto_hash_final(&desc, temp_sum);