From: <zhe.he@windriver.com>
To: <rostedt@goodmis.org>, <acme@redhat.com>, <tstoyanov@vmware.com>,
<hewenliang4@huawei.com>, <linux-kernel@vger.kernel.org>,
<zhe.he@windriver.com>
Subject: [PATCH v3] tools lib traceevent: Take care of return value of asprintf
Date: Thu, 20 Feb 2020 09:58:50 +0800 [thread overview]
Message-ID: <1582163930-233692-1-git-send-email-zhe.he@windriver.com> (raw)
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:
--
2.7.4
next reply other threads:[~2020-02-20 2:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-20 1:58 zhe.he [this message]
2020-03-25 13:05 ` [PATCH v3] tools lib traceevent: Take care of return value of asprintf He Zhe
2020-03-25 13:24 ` Steven Rostedt
2020-03-25 13:35 ` Arnaldo Carvalho de Melo
2020-04-07 2:24 ` Steven Rostedt
2020-04-07 12:33 ` Arnaldo Carvalho de Melo
2020-04-16 16:08 ` Arnaldo Carvalho de Melo
2020-04-22 12:17 ` [tip: perf/core] " tip-bot2 for He Zhe
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