nss-systemd: make check-pointer-deref clean

Add the needed assert changes to make the code clean
for the new check-pointer-deref script.

meson.build

@@ -2984,7 +2984,6 @@ if spatch.found()
                 'src/libsystemd/',
                 'src/network/',
                 'src/nspawn/',
-                'src/nss-systemd/',
                 'src/shared/',
                 # libc/ has no assert() or systemd-headers so leave it
                 'src/libc/',

src/nss-systemd/nss-systemd.c

@@ -149,6 +149,7 @@ static enum nss_status copy_synthesized_passwd(
 
         assert(dest);
         assert(src);
+        assert(errnop);
         assert(src->pw_name);
         assert(src->pw_passwd);
         assert(src->pw_gecos);
@@ -191,6 +192,7 @@ static enum nss_status copy_synthesized_spwd(
 
         assert(dest);
         assert(src);
+        assert(errnop);
         assert(src->sp_namp);
         assert(src->sp_pwdp);
 
@@ -223,6 +225,7 @@ static enum nss_status copy_synthesized_group(
 
         assert(dest);
         assert(src);
+        assert(errnop);
         assert(src->gr_name);
         assert(src->gr_passwd);
         assert(src->gr_mem);
@@ -259,6 +262,7 @@ static enum nss_status copy_synthesized_sgrp(
 
         assert(dest);
         assert(src);
+        assert(errnop);
         assert(src->sg_namp);
         assert(src->sg_passwd);
         assert(src->sg_adm);

src/nss-systemd/userdb-glue.c

@@ -415,6 +415,9 @@ enum nss_status userdb_getgrgid(
  * string vector strv and stores amount of pointers in n and total
  * length of all contained strings including NUL bytes in len. */
 static void nss_count_strv(char * const *strv, size_t *n, size_t *len) {
+        assert(n);
+        assert(len);
+
         STRV_FOREACH(str, strv) {
                 (*len) += sizeof(char*);  /* space for array entry */
                 (*len) += strlen(*str) + 1;