psktool: tighten allocation check

Spotted by gcc analyzer:
  psk.c:275:21: warning: use of possibly-NULL '_username.data' where non-null expected [CWE-690] [-Wanalyzer-possible-null-argument]
    275 |                 if (strncmp(p, (const char *) _username.data,
        |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Signed-off-by: Daiki Ueno <ueno@gnu.org>

1 files changed, 5 insertions, 1 deletions

diff --git a/src/psk.c b/src/psk.c
index 4b8a62957a..58499bd087 100644
--- a/src/psk.c
+++ b/src/psk.c
@@ -247,7 +247,11 @@ write_key(const char *username, const unsigned char *key, size_t key_size,
 		_username.data = (void *)new_data;
 		_username.size = new_size - 1;
 	} else {
-		_username.data = (void *)strdup(username);
+		_username.data = (void *)gnutls_strdup(username);
+		if (!_username.data) {
+			ret = -1;
+			goto out;
+		}
 		_username.size = strlen(username);
 	}