linux-kernel - [PATCH v2] modpost: fix asprintf warnings

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Date:	Wed,  9 Dec 2009 20:16:19 -0500
From:	Mike Frysinger <vapier@...too.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH v2] modpost: fix asprintf warnings

On compilers with security warnings enabled by default, we get:

scripts/mod/modpost.c: In function 'get_markers':
scripts/mod/modpost.c:1562: warning: ignoring return value of 'asprintf',
                                     declared with attribute warn_unused_result
scripts/mod/modpost.c: In function 'add_marker':
scripts/mod/modpost.c:1982: warning: ignoring return value of 'asprintf',
                                     declared with attribute warn_unused_result

So check the return value and abort on errors.

Signed-off-by: Mike Frysinger <vapier@...too.org>
---
v2
	- add missing newline pointed out by Américo Wang

 scripts/mod/modpost.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 801a16a..6608ebd 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1559,7 +1559,8 @@ static void get_markers(struct elf_info *info, struct module *mod)
 			const char *name = strings + sym->st_value;
 			const char *fmt = strchr(name, '\0') + 1;
 			char *line = NULL;
-			asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt);
+			if (asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt) == -1)
+				fatal("asprintf() with %s failed\n", name);
 			NOFAIL(line);
 			mod->markers[n++] = line;
 		}
@@ -1979,7 +1980,8 @@ static void write_dump(const char *fname)
 static void add_marker(struct module *mod, const char *name, const char *fmt)
 {
 	char *line = NULL;
-	asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt);
+	if (asprintf(&line, "%s\t%s\t%s\n", name, mod->name, fmt) == -1)
+		fatal("asprintf() with %s failed\n", name);
 	NOFAIL(line);
 
 	mod->markers = NOFAIL(realloc(mod->markers, ((mod->nmarkers + 1) *
-- 
1.6.5.5

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