silc_stack_free can now be called with NULL stack

[silc.git] / lib / silcutil / silcstack.c

diff --git a/lib/silcutil/silcstack.c b/lib/silcutil/silcstack.c
index 9432b22d25c10c69693345f6072156fd1b8066f8..6107cf047598a912e888fa55aadc59850b4f2be5 100644 (file)
--- a/lib/silcutil/silcstack.c
+++ b/lib/silcutil/silcstack.c
@@ -4,7 +4,7 @@
 
   Author: Pekka Riikonen <priikone@silcnet.org>
 
-  Copyright (C) 2003 - 2006 Pekka Riikonen
+  Copyright (C) 2003 - 2008 Pekka Riikonen
 
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -66,6 +66,9 @@ void silc_stack_free(SilcStack stack)
 {
   int i;
 
+  if (!stack)
+    return;
+
   silc_free(stack->frames);
   for (i = 0; i < SILC_STACK_BLOCK_NUM; i++)
     silc_free(stack->stack[i]);
@@ -267,7 +270,8 @@ void *silc_stack_realloc(SilcStack stack, SilcUInt32 old_size,
   /* Check that `ptr' is last allocation */
   sptr = (unsigned char *)stack->stack[si] +
     SILC_STACK_ALIGN(sizeof(**stack->stack), SILC_STACK_DEFAULT_ALIGN);
-  if (stack->stack[si]->bytes_left + old_size + (ptr - sptr) != bsize) {
+  if (stack->stack[si]->bytes_left + old_size +
+      ((unsigned char *)ptr - (unsigned char *)sptr) != bsize) {
     SILC_LOG_DEBUG(("Cannot reallocate"));
     SILC_STACK_STAT(stack, num_errors, 1);
     return NULL;