tests-fuzz: replace asserts with regular checks to mute warnings

tests-fuzz/fuzz_packet.c

@@ -14,7 +14,6 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <assert.h>
 #include <stdint.h>
 
 #include "libknot/libknot.h"
@@ -25,9 +24,10 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 	memcpy(copy, data, size);
 
 	knot_pkt_t *pkt = knot_pkt_new(copy, size, NULL);
-	assert(pkt);
-	knot_pkt_parse(pkt, 0);
-	knot_pkt_free(pkt);
+	if (pkt != NULL) {
+		knot_pkt_parse(pkt, 0);
+		knot_pkt_free(pkt);
+	}
 
 	return 0;
 }

tests-fuzz/fuzz_zscanner.c

-/*  Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+/*  Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -14,19 +14,17 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <assert.h>
 #include <stdint.h>
 
 #include "zscanner/scanner.h"
 
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
-	zs_scanner_t s = { 0 };
-	assert(zs_init(&s, ".", 1, 0) == 0);
-	assert(zs_set_input_string(&s, (const char *)data, size) == 0);
-
-	zs_parse_all(&s);
-
+	zs_scanner_t s;
+	if (zs_init(&s, ".", 1, 0) == 0 &&
+	    zs_set_input_string(&s, (const char *)data, size) == 0) {
+		zs_parse_all(&s);
+	}
 	zs_deinit(&s);
 	
 	return 0;

tests-fuzz/main.c

@@ -20,7 +20,6 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
-#include <assert.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <stdlib.h>
@@ -51,7 +50,9 @@ static void test_all_from(const char *dirname)
 
 		char fname[strlen(dirname) + strlen(dp->d_name) + 2];
 		int ret = snprintf(fname, sizeof(fname), "%s/%s", dirname, dp->d_name);
-		assert(ret > 0 && ret < sizeof(fname));
+		if (ret < 0 || ret >= sizeof(fname)) {
+			fprintf(stderr, "Invalid path %s/%s\n", dirname, dp->d_name);
+		}
 
 		int fd;
 		if ((fd = open(fname, O_RDONLY)) == -1) {
@@ -67,7 +68,11 @@ static void test_all_from(const char *dirname)
 		}
 
 		uint8_t *data = malloc(st.st_size);
-		assert(data);
+		if (data == NULL) {
+			fprintf(stderr, "Failed to stat %d (%d)\n", fd, ENOMEM);
+			close(fd);
+			continue;
+		}
 
 		ssize_t n;
 		if ((n = read(fd, data, st.st_size)) == st.st_size) {
@@ -98,12 +103,16 @@ int main(int argc, char **argv)
 	}
 
 	int ret = snprintf(corporadir, sizeof(corporadir), SRCDIR "/%s.in", target);
-	assert(ret > 0 && ret < sizeof(corporadir));
+	if (ret < 0 || ret >= sizeof(corporadir)) {
+		fprintf(stderr, "Invalid path %s/%s\n", SRCDIR "/%s.in", target);
+	}
 
 	test_all_from(corporadir);
 
 	ret = snprintf(corporadir, sizeof(corporadir), SRCDIR "/%s.repro", target);
-	assert(ret > 0 && ret < sizeof(corporadir));
+	if (ret < 0 || ret >= sizeof(corporadir)) {
+		fprintf(stderr, "Invalid path %s/%s\n", SRCDIR "/%s.repro", target);
+	}
 
 	test_all_from(corporadir);