Check stk before dereferencing

Ron Dahlgren · Ron Dahlgren · commit 12203a76c22c · 2013-06-09T10:43:16.000-07:00
This commit fixes #7022 - I've added an additional check to ensure that stk is not null before dereferencing it to get it's next element, assigning NULL if it is itself NULL.
diff --git a/src/rt/rust_task.cpp b/src/rt/rust_task.cpp
@@ -612,7 +612,7 @@ rust_task::new_big_stack() {
     }
 
     big_stack->task = this;
-    big_stack->next = stk->next;
+    big_stack->next = stk ? stk->next : NULL;
     if (big_stack->next)
         big_stack->next->prev = big_stack;
     big_stack->prev = stk;

Original file line number	Diff line number	Diff line change
`@@ -612,7 +612,7 @@ rust_task::new_big_stack() {`
`612`	`612`	`}`
`613`	`613`
`614`	`614`	`big_stack->task = this;`
`615`		`- big_stack->next = stk->next;`
	`615`	`+ big_stack->next = stk ? stk->next : NULL;`
`616`	`616`	`if (big_stack->next)`
`617`	`617`	`big_stack->next->prev = big_stack;`
`618`	`618`	`big_stack->prev = stk;`