cryptsetup: don't assert on variable which is optional

https://github.com/systemd/systemd/commit/50d2eba27b9bfc77ef6b40e5721713846815418b#commitcomment-34519739

In add_crypttab_devices() split_keyspec is called on the keyfile argument,
which may be NULL.

1 files changed, 6 insertions, 2 deletions

diff --git a/src/cryptsetup/cryptsetup-generator.c b/src/cryptsetup/cryptsetup-generator.c
index 8448314394..4815ded753 100644
--- a/src/cryptsetup/cryptsetup-generator.c
+++ b/src/cryptsetup/cryptsetup-generator.c
@@ -50,10 +50,14 @@ static int split_keyspec(const char *keyspec, char **ret_keyfile, char **ret_key
         _cleanup_free_ char *keyfile = NULL, *keydev = NULL;
         const char *c;
 
-        assert(keyspec);
         assert(ret_keyfile);
         assert(ret_keydev);
 
+        if (!keyspec) {
+                *ret_keyfile = *ret_keydev = NULL;
+                return 0;
+        }
+
         c = strrchr(keyspec, ':');
         if (c) {
                 keyfile = strndup(keyspec, c-keyspec);
@@ -567,7 +571,7 @@ static int add_crypttab_devices(void) {
         }
 
         for (;;) {
-                _cleanup_free_ char *line = NULL, *name = NULL, *device = NULL, *keydev = NULL, *keyfile = NULL, *keyspec = NULL, *options = NULL;
+                _cleanup_free_ char *line = NULL, *name = NULL, *device = NULL, *keyspec = NULL, *options = NULL, *keyfile = NULL, *keydev = NULL;
                 crypto_device *d = NULL;
                 char *l, *uuid;
                 int k;