diff --git a/hs20/client/osu_client.c b/hs20/client/osu_client.c
index 7b274dac9..01e7b7553 100644
--- a/hs20/client/osu_client.c
+++ b/hs20/client/osu_client.c
@@ -2018,6 +2018,7 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
 	struct osu_data *osu = NULL, *last = NULL;
 	size_t osu_count = 0;
 	char *pos, *end;
+	int res;
 
 	f = fopen(fname, "r");
 	if (f == NULL) {
@@ -2037,15 +2038,20 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
 			osu = last;
 			last = &osu[osu_count++];
 			memset(last, 0, sizeof(*last));
-			snprintf(last->bssid, sizeof(last->bssid), "%s",
-				 buf + 13);
+			res = os_snprintf(last->bssid, sizeof(last->bssid),
+					  "%s", buf + 13);
+			if (os_snprintf_error(sizeof(last->bssid), res))
+				break;
 			continue;
 		}
 		if (!last)
 			continue;
 
 		if (strncmp(buf, "uri=", 4) == 0) {
-			snprintf(last->url, sizeof(last->url), "%s", buf + 4);
+			res = os_snprintf(last->url, sizeof(last->url),
+					  "%s", buf + 4);
+			if (os_snprintf_error(sizeof(last->url), res))
+				break;
 			continue;
 		}
 
@@ -2055,26 +2061,37 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
 		}
 
 		if (strncmp(buf, "osu_ssid=", 9) == 0) {
-			snprintf(last->osu_ssid, sizeof(last->osu_ssid),
-				 "%s", buf + 9);
+			res = os_snprintf(last->osu_ssid,
+					  sizeof(last->osu_ssid),
+					  "%s", buf + 9);
+			if (os_snprintf_error(sizeof(last->osu_ssid), res))
+				break;
 			continue;
 		}
 
 		if (strncmp(buf, "osu_ssid2=", 10) == 0) {
-			snprintf(last->osu_ssid2, sizeof(last->osu_ssid2),
-				 "%s", buf + 10);
+			res = os_snprintf(last->osu_ssid2,
+					  sizeof(last->osu_ssid2),
+					  "%s", buf + 10);
+			if (os_snprintf_error(sizeof(last->osu_ssid2), res))
+				break;
 			continue;
 		}
 
 		if (os_strncmp(buf, "osu_nai=", 8) == 0) {
-			os_snprintf(last->osu_nai, sizeof(last->osu_nai),
-				    "%s", buf + 8);
+			res = os_snprintf(last->osu_nai, sizeof(last->osu_nai),
+					  "%s", buf + 8);
+			if (os_snprintf_error(sizeof(last->osu_nai), res))
+				break;
 			continue;
 		}
 
 		if (os_strncmp(buf, "osu_nai2=", 9) == 0) {
-			os_snprintf(last->osu_nai2, sizeof(last->osu_nai2),
-				    "%s", buf + 9);
+			res = os_snprintf(last->osu_nai2,
+					  sizeof(last->osu_nai2),
+					  "%s", buf + 9);
+			if (os_snprintf_error(sizeof(last->osu_nai2), res))
+				break;
 			continue;
 		}
 
@@ -2087,8 +2104,14 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
 				continue;
 			*pos++ = '\0';
 			txt = &last->friendly_name[last->friendly_name_count++];
-			snprintf(txt->lang, sizeof(txt->lang), "%s", buf + 14);
-			snprintf(txt->text, sizeof(txt->text), "%s", pos);
+			res = os_snprintf(txt->lang, sizeof(txt->lang),
+					  "%s", buf + 14);
+			if (os_snprintf_error(sizeof(txt->lang), res))
+				break;
+			res = os_snprintf(txt->text, sizeof(txt->text),
+					  "%s", pos);
+			if (os_snprintf_error(sizeof(txt->text), res))
+				break;
 		}
 
 		if (strncmp(buf, "desc=", 5) == 0) {
@@ -2100,8 +2123,14 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
 				continue;
 			*pos++ = '\0';
 			txt = &last->serv_desc[last->serv_desc_count++];
-			snprintf(txt->lang, sizeof(txt->lang), "%s", buf + 5);
-			snprintf(txt->text, sizeof(txt->text), "%s", pos);
+			res = os_snprintf(txt->lang, sizeof(txt->lang),
+					  "%s", buf + 5);
+			if (os_snprintf_error(sizeof(txt->lang), res))
+				break;
+			res = os_snprintf(txt->text, sizeof(txt->text),
+					  "%s", pos);
+			if (os_snprintf_error(sizeof(txt->text), res))
+				break;
 		}
 
 		if (strncmp(buf, "icon=", 5) == 0) {
@@ -2124,23 +2153,30 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
 			if (!end)
 				continue;
 			*end = '\0';
-			snprintf(icon->lang, sizeof(icon->lang), "%s", pos);
+			res = os_snprintf(icon->lang, sizeof(icon->lang),
+					  "%s", pos);
+			if (os_snprintf_error(sizeof(icon->lang), res))
+				break;
 			pos = end + 1;
 
 			end = strchr(pos, ':');
 			if (end)
 				*end = '\0';
-			snprintf(icon->mime_type, sizeof(icon->mime_type),
-				 "%s", pos);
-			if (!pos)
+			res = os_snprintf(icon->mime_type,
+					  sizeof(icon->mime_type), "%s", pos);
+			if (os_snprintf_error(sizeof(icon->mime_type), res))
+				break;
+			if (!end)
 				continue;
 			pos = end + 1;
 
 			end = strchr(pos, ':');
 			if (end)
 				*end = '\0';
-			snprintf(icon->filename, sizeof(icon->filename),
-				 "%s", pos);
+			res = os_snprintf(icon->filename,
+					  sizeof(icon->filename), "%s", pos);
+			if (os_snprintf_error(sizeof(icon->filename), res))
+				break;
 			continue;
 		}
 	}