fix(dracut-util): do not call `strcmp` if the `value` argument is NULL

The behavior of `strcmp` is undefined if any of its arguments is NULL, which
can lead to a segfault depending on the implementation. So, this check is
required to be able to use `getargs` with options where the value is optional,
e.g., with `rd.break`.

diff --git a/src/util/util.c b/src/util/util.c
index b3498df6cd84b9b1834ef599e3aa09a40efbe600..1d152418d91e73bfa9e21f709688ac20590e361d 100644 (file)
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -273,7 +273,7 @@ static int getargs(int argc, char **argv)
                 cmdline = next_arg(cmdline, &key, &value);
                 if (strcmp(key, search_key) == 0) {
                         if (search_value) {
-                                if (strcmp(value, search_value) == 0) {
+                                if (value && strcmp(value, search_value) == 0) {
                                         printf("%s\n", value);
                                         found_value = true;
                                 }