Assert on output buffer overflow.
diff --git a/dlls/ntdll/debugtools.c b/dlls/ntdll/debugtools.c
index 9cc73b7..1e5ae58 100644
--- a/dlls/ntdll/debugtools.c
+++ b/dlls/ntdll/debugtools.c
@@ -2,6 +2,7 @@
* Debugging functions
*/
+#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -198,9 +199,17 @@
int wine_dbg_vprintf( const char *format, va_list args )
{
struct debug_info *info = get_info();
+ char *p;
- int ret = vsprintf( info->out_pos, format, args );
- char *p = strrchr( info->out_pos, '\n' );
+ int ret = vsnprintf( info->out_pos, sizeof(info->output) - (info->out_pos - info->output),
+ format, args );
+
+ /* make sure we didn't exceed the buffer length
+ * the two asserts are due to glibc changes in vsnprintfs return value */
+ assert( ret != -1 );
+ assert( ret < sizeof(info->output) - (info->out_pos - info->output) );
+
+ p = strrchr( info->out_pos, '\n' );
if (!p) info->out_pos += ret;
else
{
