Re: [PATCH] perf kmem: Fix memory leak in compact_gfp_flags()

From: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
To: Yunfeng Ye <yeyunfeng@huawei.com>
Cc: peterz@infradead.org, mingo@redhat.com, mark.rutland@arm.com,
	alexander.shishkin@linux.intel.com, jolsa@redhat.com,
	namhyung@kernel.org, linux-kernel@vger.kernel.org,
	hushiyuan@huawei.com, linfeilong@huawei.com
Subject: Re: [PATCH] perf kmem: Fix memory leak in compact_gfp_flags()
Date: Wed, 16 Oct 2019 10:04:03 -0300	[thread overview]
Message-ID: <20191016130403.GA22835@kernel.org> (raw)
In-Reply-To: <f9e9f458-96f3-4a97-a1d5-9feec2420e07@huawei.com>

Em Wed, Oct 16, 2019 at 04:38:45PM +0800, Yunfeng Ye escreveu:
> The memory @orig_flags is allocated by strdup(), it is freed on the
> normal path, but leak to free on the error path.

Are you using some tool to find out these problems? Or is it just visual
inspection?

- Arnaldo

> Fix this by adding free(orig_flags) on the error path.
> 
> Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
> ---
>  tools/perf/builtin-kmem.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
> index 1e61e353f579..9661671cc26e 100644
> --- a/tools/perf/builtin-kmem.c
> +++ b/tools/perf/builtin-kmem.c
> @@ -691,6 +691,7 @@ static char *compact_gfp_flags(char *gfp_flags)
>  			new = realloc(new_flags, len + strlen(cpt) + 2);
>  			if (new == NULL) {
>  				free(new_flags);
> +				free(orig_flags);
>  				return NULL;
>  			}
> 
> -- 
> 2.7.4.3

-- 

- Arnaldo