[PATCH 01/12] selftests: gpio-mockup-chardev: Check asprintf() for error

From: Geert Uytterhoeven
Date: Mon Jan 14 2019 - 08:51:52 EST


With gcc 7.3.0:

gpio-mockup-chardev.c: In function âget_debugfsâ:
gpio-mockup-chardev.c:62:3: warning: ignoring return value of âasprintfâ, declared with attribute warn_unused_result [-Wunused-result]
asprintf(path, "%s/gpio", mnt_fs_get_target(fs));
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Handle asprintf() failures to fix this.

Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
---
tools/testing/selftests/gpio/gpio-mockup-chardev.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/gpio/gpio-mockup-chardev.c b/tools/testing/selftests/gpio/gpio-mockup-chardev.c
index f8d468f54e986dd0..aaa1e9f083c37215 100644
--- a/tools/testing/selftests/gpio/gpio-mockup-chardev.c
+++ b/tools/testing/selftests/gpio/gpio-mockup-chardev.c
@@ -37,7 +37,7 @@ static int get_debugfs(char **path)
struct libmnt_table *tb;
struct libmnt_iter *itr = NULL;
struct libmnt_fs *fs;
- int found = 0;
+ int found = 0, ret;

cxt = mnt_new_context();
if (!cxt)
@@ -58,8 +58,11 @@ static int get_debugfs(char **path)
break;
}
}
- if (found)
- asprintf(path, "%s/gpio", mnt_fs_get_target(fs));
+ if (found) {
+ ret = asprintf(path, "%s/gpio", mnt_fs_get_target(fs));
+ if (ret < 0)
+ err(EXIT_FAILURE, "failed to format string");
+ }

mnt_free_iter(itr);
mnt_free_context(cxt);
--
2.17.1