linux-kernel - Re: [PATCH 1/1] perf/util: initialize is_test value in expr__ctx

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Message-ID: <c03b1604-cc41-4746-be3a-fc326152d556@linaro.org>
Date: Wed, 13 Nov 2024 16:13:01 +0000
From: James Clark <james.clark@...aro.org>
To: Levi Yun <yeoreum.yun@....com>
Cc: linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
 nd@....com, namhyung@...nel.org, mark.rutland@....com, irogers@...gle.com,
 james.clark2@....com
Subject: Re: [PATCH 1/1] perf/util: initialize is_test value in
 expr__ctx_new()



On 08/11/2024 2:34 pm, Levi Yun wrote:
> when expr_parse_ctx is allocated by expr_ctx_new(),
> expr_scanner_ctx->is_test isn't initialize, so it has garbage value.
> this can affects the result of expr__parse() return when it parses
> non-exist event literal according to garbage value.
> 
> use calloc instead of malloc in expr_ctx_new() to fix this.
> 
> Fixes: 3340a08354ac ("perf pmu-events: Fix testing with JEVENTS_ARCH=all")
> Signed-off-by: Levi Yun <yeoreum.yun@....com>
> ---
>   tools/perf/util/expr.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> index 5e3732bc2fa5..bc119501f091 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -285,7 +285,7 @@ struct expr_parse_ctx *expr__ctx_new(void)
>   {
>   	struct expr_parse_ctx *ctx;
> 
> -	ctx = malloc(sizeof(struct expr_parse_ctx));
> +	ctx = calloc(1, sizeof(struct expr_parse_ctx));
>   	if (!ctx)
>   		return NULL;
> 
> @@ -294,9 +294,6 @@ struct expr_parse_ctx *expr__ctx_new(void)
>   		free(ctx);
>   		return NULL;
>   	}
> -	ctx->sctx.user_requested_cpu_list = NULL;
> -	ctx->sctx.runtime = 0;
> -	ctx->sctx.system_wide = false;
> 
>   	return ctx;
>   }
> --
> LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}
> 
> 

Reviewed-by: James Clark <james.clark@...aro.org>