Re: [PATCH] xrealloc: do not reuse pointer freed by zero-length realloc()

From: Andreas Schwab <schwab@linux-m68k.org>
To: Jeff King <peff@peff.net>
Cc: git@vger.kernel.org
Subject: Re: [PATCH] xrealloc: do not reuse pointer freed by zero-length realloc()
Date: Tue, 01 Sep 2020 17:20:23 +0200	[thread overview]
Message-ID: <87o8mp8qx4.fsf@igel.home> (raw)
In-Reply-To: <20200901111800.GA3115584@coredump.intra.peff.net> (Jeff King's message of "Tue, 1 Sep 2020 07:18:00 -0400")

On Sep 01 2020, Jeff King wrote:

> diff --git a/wrapper.c b/wrapper.c
> index 4ff4a9c3db..b0d375beee 100644
> --- a/wrapper.c
> +++ b/wrapper.c
> @@ -120,7 +120,7 @@ void *xrealloc(void *ptr, size_t size)
>  	memory_limit_check(size, 0);
>  	ret = realloc(ptr, size);
>  	if (!ret && !size)
> -		ret = realloc(ptr, 1);
> +		ret = realloc(ret, 1);

Since you already know ret == NULL, you could just say malloc(1), As
written, it looks like a typo (why use a variable to pass a constant?).

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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