Validate JSON for --jsonarg

Fixes #2572

src/main.c

@@ -317,7 +317,12 @@ int main(int argc, char* argv[]) {
       if (further_args_are_strings) {
         ARGS = jv_array_append(ARGS, jv_string(argv[i]));
       } else if (further_args_are_json) {
-        ARGS = jv_array_append(ARGS, jv_parse(argv[i]));
+        jv v =  jv_parse(argv[i]);
+        if (!jv_is_valid(v)) {
+          fprintf(stderr, "%s: invalid JSON text passed to --jsonargs\n", progname);
+          die();
+        }
+        ARGS = jv_array_append(ARGS, v);
       } else {
         jq_util_input_add_input(input_state, argv[i]);
         nfiles++;
@@ -330,7 +335,12 @@ int main(int argc, char* argv[]) {
         if (further_args_are_strings) {
           ARGS = jv_array_append(ARGS, jv_string(argv[i]));
         } else if (further_args_are_json) {
-          ARGS = jv_array_append(ARGS, jv_parse(argv[i]));
+          jv v =  jv_parse(argv[i]);
+          if (!jv_is_valid(v)) {
+            fprintf(stderr, "%s: invalid JSON text passed to --jsonargs\n", progname);
+            die();
+          }
+          ARGS = jv_array_append(ARGS, v);
         } else {
           jq_util_input_add_input(input_state, argv[i]);
           nfiles++;

tests/shtest

@@ -207,6 +207,19 @@ fi
 echo '{"a":1,"b",' | $JQ --stream  > /dev/null 2> $d/err
 grep 'Objects must consist of key:value pairs' $d/err > /dev/null
 
+## Regression test for issue #2572 assert when using --jsonargs and invalid JSON
+$JQ -n --jsonargs null invalid && EC=$? || EC=$?
+if [ "$EC" -ne 2 ]; then
+    echo "--jsonargs exited with wrong exit code, expected 2 got $EC" 1>&2
+    exit 1
+fi
+# this tests the args_done code path "--"
+$JQ -n --jsonargs null -- invalid && EC=$? || EC=$?
+if [ "$EC" -ne 2 ]; then
+    echo "--jsonargs exited with wrong exit code, expected 2 got $EC" 1>&2
+    exit 1
+fi
+
 ## Fuzz parser
 
 ## XXX With a $(urandom) builtin we could move this test into tests/all.test