[PATCH 4.20 28/88] selftests: gpio-mockup-chardev: Check asprintf() for error

From: Greg Kroah-Hartman
Date: Mon Mar 04 2019 - 03:33:07 EST


4.20-stable review patch. If anyone has any objections, please let me know.

------------------

[ Upstream commit 508cacd7da6659ae7b7bdd0a335f675422277758 ]

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>
Signed-off-by: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 f8d468f54e986..aaa1e9f083c37 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);
--
2.19.1