From 81dab3215635302fc9e2e2f3828092896aa4e6d9 Mon Sep 17 00:00:00 2001
From: Yifan Lu
Date: Sun, 23 Oct 2016 22:19:56 -0700
Subject: Forgot NULL pointer check

---
 lib/hook-functions.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/lib/hook-functions.c b/lib/hook-functions.c
index f59126a..1c96d61 100644
--- a/lib/hook-functions.c
+++ b/lib/hook-functions.c
@@ -292,10 +292,12 @@ int substitute_hook_functions(const struct substitute_function_hook *hooks,
         fws[i].src = hi->jump_patch;
         fws[i].len = hi->jump_patch_size;
         fws[i].opt = hooks[i].opt;
-        records->function = hi->code;
-        records->buffer_size = hi->jump_patch_size;
-        memcpy(records->saved_buffer, hi->code, hi->jump_patch_size);
-        records = (struct substitute_function_hook_record *)((char *)&records->saved_buffer + records->buffer_size);
+        if (records) {
+            records->function = hi->code;
+            records->buffer_size = hi->jump_patch_size;
+            memcpy(records->saved_buffer, hi->code, hi->jump_patch_size);
+            records = (struct substitute_function_hook_record *)((char *)&records->saved_buffer + records->buffer_size);
+        }
     }
 
     struct pc_callback_info info = {his, nhooks, false};
-- 
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