Re: [PATCH v2] signal: Avoid undefined behaviour in kill_something_info

[Oleg Nesterov]

On 06/05, zhongjiang wrote:
>
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -1395,6 +1395,12 @@ static int kill_something_info(int sig, struct siginfo 
> *info, pid_t pid)
>
>       read_lock(&tasklist_lock);
>       if (pid != -1) {
> +             /*
> +              * -INT_MIN is undefined, it need to exclude following case to
> +              * avoid the UBSAN detection.
> +              */
> +             if (pid == INT_MIN)
> +                     return -ESRCH;

you need to do this before read_lock(tasklist)

Oleg.