linux-kernel - Re: [PATCH] signal: Fix the error return of kill -1

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Message-ID: <20230815151149.GA29072@redhat.com>
Date:   Tue, 15 Aug 2023 17:11:50 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     David Laight <David.Laight@...LAB.COM>
Cc:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Petr Skocik <pskocik@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Marco Elver <elver@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] signal: Fix the error return of kill -1

On 08/15, David Laight wrote:
>
> or maybe even:
> 	} else {
> 		struct task_struct * p;
> 		int err;
> 		ret = -ESRCH;
>
> 		for_each_process(p) {
> 			if (task_pid_vnr(p) > 1 &&
> 					!same_thread_group(p, current)) {
> 				err = group_send_sig_info(sig, info, p,
> 							  PIDTYPE_MAX);
> 				if (ret)
> 					ret = err;

Hmm, indeed ;)

and "err" can be declared inside the loop.

Oleg.