linux-kernel - Re: [PATCH] [RFC V1]s390/perf: fix 'start' address of module's map

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Message-ID: <20160708152046.GI31763@krava>
Date:	Fri, 8 Jul 2016 17:20:46 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Song Shan Gong <gongss@...ux.vnet.ibm.com>
Cc:	acme@...nel.org, jolsa@...nel.org, dsahern@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC V1]s390/perf: fix 'start' address of module's map

On Thu, Jul 07, 2016 at 09:49:36AM +0800, Song Shan Gong wrote:

SNIP

> +libperf-y += sym-handling.o
> diff --git a/tools/perf/arch/s390/util/sym-handling.c b/tools/perf/arch/s390/util/sym-handling.c
> new file mode 100644
> index 0000000..efe2a50
> --- /dev/null
> +++ b/tools/perf/arch/s390/util/sym-handling.c
> @@ -0,0 +1,49 @@
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <unistd.h>
> +#include "symbol.h"
> +#include "map.h"
> +#include "util.h"
> +#include "machine.h"
> +
> +int arch__fix_module_baseaddr(struct machine *machine,
> +		u64 *start, const char *name)
> +{
> +	char path[PATH_MAX];
> +	char *module_name = strdup(name);

we have a rule to check on every allocated pointer,
pelase check module_name != NULL before using it

> +	int len = strlen(module_name);
> +	FILE *file;
> +	int err = 0;
> +	u64 text_start;
> +	char *line = NULL;
> +	size_t n;
> +	char *sep;
> +
> +	module_name[len - 1] = '\0';
> +	module_name += 1;

hum, why do increase the pointer?

thanks,
jirka