linux-kernel - Re: [PATCH -next] tools build: Check return value of fwrite_unlocked in jvmti

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Message-ID: <20200728121045.GC40195@kernel.org>
Date:   Tue, 28 Jul 2020 09:10:45 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Wang ShaoBo <bobo.shaobowang@...wei.com>
Cc:     cj.chengjian@...wei.com, huawei.libin@...wei.com, jolsa@...hat.com,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH -next] tools build: Check return value of fwrite_unlocked
 in jvmti_agent.c

Em Fri, Jul 24, 2020 at 06:07:06PM +0800, Wang ShaoBo escreveu:
> Function jvmti_write_code called by compiled_method_load_cb may return
> error in using fwrite_unlocked, this failure should be captured and
> warned.

Thanks, applied.

- Arnaldo
 
> Signed-off-by: Wang ShaoBo <bobo.shaobowang@...wei.com>
> ---
>  tools/perf/jvmti/jvmti_agent.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/perf/jvmti/jvmti_agent.c b/tools/perf/jvmti/jvmti_agent.c
> index 88108598d6e9..a1fe6aa16b6d 100644
> --- a/tools/perf/jvmti/jvmti_agent.c
> +++ b/tools/perf/jvmti/jvmti_agent.c
> @@ -363,7 +363,7 @@ jvmti_write_code(void *agent, char const *sym,
>  	struct jr_code_load rec;
>  	size_t sym_len;
>  	FILE *fp = agent;
> -	int ret = -1;
> +	int ret;
>  
>  	/* don't care about 0 length function, no samples */
>  	if (size == 0)
> @@ -401,16 +401,23 @@ jvmti_write_code(void *agent, char const *sym,
>  	rec.code_index = code_generation++;
>  
>  	ret = fwrite_unlocked(&rec, sizeof(rec), 1, fp);
> -	fwrite_unlocked(sym, sym_len, 1, fp);
> +	if (ret)
> +		goto error;
> +	ret = fwrite_unlocked(sym, sym_len, 1, fp);
> +	if (ret)
> +		goto error;
>  
> -	if (code)
> -		fwrite_unlocked(code, size, 1, fp);
> +	if (code) {
> +		ret = fwrite_unlocked(code, size, 1, fp);
> +		if (ret)
> +			goto error;
> +	}
>  
>  	funlockfile(fp);
> -
> -	ret = 0;
> -
> -	return ret;
> +	return 0;
> +error:
> +	funlockfile(fp);
> +	return -1;
>  }
>  
>  int
> -- 
> 2.17.1
> 

-- 

- Arnaldo