linux-kernel - Re: [PATCH 07/12] perf kvm: handle realloc failures

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Message-ID: <20121008201956.GE2631@ghostprotocols.net>
Date:	Mon, 8 Oct 2012 13:19:56 -0700
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David Ahern <dsahern@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	peterz@...radead.org, fweisbec@...il.com,
	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Dong Hao <haodong@...ux.vnet.ibm.com>
Subject: Re: [PATCH 07/12] perf kvm: handle realloc failures

Em Mon, Oct 08, 2012 at 11:17:31AM -0600, David Ahern escreveu:
> Save previous pointer and free on failure.

<SNIP>
 
> +	prev = event->vcpu;
>  	event->vcpu = realloc(event->vcpu,
>  			      event->max_vcpu * sizeof(*event->vcpu));
>  	if (!event->vcpu) {
> +		free(prev);
>  		pr_err("Not enough memory\n");

Unfamiliar way of doing it, usually we do it like:

  	vcpu = realloc(event->vcpu, event->max_vcpu * sizeof(*event->vcpu));

	if (!vcpu) {
  		pr_err("Not enough memory\n");
		return -1;
	}

	event->vcpu = vcpu;

I.e. we don't trow away the old value of event->vcpu.

- Arnaldo
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