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SubjectRe: [PATCH v3] tools lib traceevent: Take care of return value of asprintf
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Can this be considered for the moment?

Thanks,
Zhe

On 2/20/20 9:58 AM, zhe.he@windriver.com wrote:
> From: He Zhe <zhe.he@windriver.com>
>
> According to the API, if memory allocation wasn't possible, or some other
> error occurs, asprintf will return -1, and the contents of strp below are
> undefined.
>
> int asprintf(char **strp, const char *fmt, ...);
>
> This patch takes care of return value of asprintf to make it less error
> prone and prevent the following build warning.
>
> ignoring return value of ‘asprintf’, declared with attribute warn_unused_result [-Wunused-result]
>
> Signed-off-by: He Zhe <zhe.he@windriver.com>
> ---
> v2: directly check the return value without saving to a variable
> v3: as asked, not remove those that already save the return value
>
> tools/lib/traceevent/parse-filter.c | 29 +++++++++++++++++++----------
> 1 file changed, 19 insertions(+), 10 deletions(-)
>
> diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
> index 20eed71..c271aee 100644
> --- a/tools/lib/traceevent/parse-filter.c
> +++ b/tools/lib/traceevent/parse-filter.c
> @@ -1958,7 +1958,8 @@ static char *op_to_str(struct tep_event_filter *filter, struct tep_filter_arg *a
> default:
> break;
> }
> - asprintf(&str, val ? "TRUE" : "FALSE");
> + if (asprintf(&str, val ? "TRUE" : "FALSE") < 0)
> + str = NULL;
> break;
> }
> }
> @@ -1976,7 +1977,8 @@ static char *op_to_str(struct tep_event_filter *filter, struct tep_filter_arg *a
> break;
> }
>
> - asprintf(&str, "(%s) %s (%s)", left, op, right);
> + if (asprintf(&str, "(%s) %s (%s)", left, op, right) < 0)
> + str = NULL;
> break;
>
> case TEP_FILTER_OP_NOT:
> @@ -1992,10 +1994,12 @@ static char *op_to_str(struct tep_event_filter *filter, struct tep_filter_arg *a
> right_val = 0;
> if (right_val >= 0) {
> /* just return the opposite */
> - asprintf(&str, right_val ? "FALSE" : "TRUE");
> + if (asprintf(&str, right_val ? "FALSE" : "TRUE") < 0)
> + str = NULL;
> break;
> }
> - asprintf(&str, "%s(%s)", op, right);
> + if (asprintf(&str, "%s(%s)", op, right) < 0)
> + str = NULL;
> break;
>
> default:
> @@ -2011,7 +2015,8 @@ static char *val_to_str(struct tep_event_filter *filter, struct tep_filter_arg *
> {
> char *str = NULL;
>
> - asprintf(&str, "%lld", arg->value.val);
> + if (asprintf(&str, "%lld", arg->value.val) < 0)
> + str = NULL;
>
> return str;
> }
> @@ -2069,7 +2074,8 @@ static char *exp_to_str(struct tep_event_filter *filter, struct tep_filter_arg *
> break;
> }
>
> - asprintf(&str, "%s %s %s", lstr, op, rstr);
> + if (asprintf(&str, "%s %s %s", lstr, op, rstr) < 0)
> + str = NULL;
> out:
> free(lstr);
> free(rstr);
> @@ -2113,7 +2119,8 @@ static char *num_to_str(struct tep_event_filter *filter, struct tep_filter_arg *
> if (!op)
> op = "<=";
>
> - asprintf(&str, "%s %s %s", lstr, op, rstr);
> + if (asprintf(&str, "%s %s %s", lstr, op, rstr) < 0)
> + str = NULL;
> break;
>
> default:
> @@ -2148,8 +2155,9 @@ static char *str_to_str(struct tep_event_filter *filter, struct tep_filter_arg *
> if (!op)
> op = "!~";
>
> - asprintf(&str, "%s %s \"%s\"",
> - arg->str.field->name, op, arg->str.val);
> + if (asprintf(&str, "%s %s \"%s\"",
> + arg->str.field->name, op, arg->str.val) < 0)
> + str = NULL;
> break;
>
> default:
> @@ -2165,7 +2173,8 @@ static char *arg_to_str(struct tep_event_filter *filter, struct tep_filter_arg *
>
> switch (arg->type) {
> case TEP_FILTER_ARG_BOOLEAN:
> - asprintf(&str, arg->boolean.value ? "TRUE" : "FALSE");
> + if (asprintf(&str, arg->boolean.value ? "TRUE" : "FALSE") < 0)
> + str = NULL;
> return str;
>
> case TEP_FILTER_ARG_OP:

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