From: Geert Uytterhoeven geert+renesas@glider.be

[ Upstream commit 508cacd7da6659ae7b7bdd0a335f675422277758 ]

With gcc 7.3.0:

gpio-mockup-chardev.c: In function ‘get_debugfs’: gpio-mockup-chardev.c:62:3: warning: ignoring return value of ‘asprintf’, 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@glider.be Signed-off-by: Shuah Khan shuah@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 f8d468f54e98..aaa1e9f083c3 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);