Re: [PATCH v3] vsprintf: Prevent crash when dereferencing invalid pointers

[Steven Rostedt]

On Thu, 15 Mar 2018 16:07:54 +0100
Petr Mladek <pmladek@xxxxxxxx> wrote:

> Good point. The following should do the job:
> 
> static const char *check_pointer_access(const void *ptr)
> {
> 	char c;
> 
> 	if (!ptr)
> 		return "(null)";
> 
> 	if ((unsigned long)ptr < TASK_SIZE || probe_kernel_address(ptr, c))

Please don't.

-- Steve

> 		return "(efault)";
> 
> 	return 0;
> }