compat: fix a crash in the netlink backport

Do not set the .doit wrapper if there is no .doit function.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/compat/compat-2.6.37.c b/compat/compat-2.6.37.c
index 52c5a32..d949a92 100644 (file)
--- a/compat/compat-2.6.37.c
+++ b/compat/compat-2.6.37.c
@@ -130,7 +130,8 @@ int compat_genl_register_family_with_ops(struct genl_family *family,
                __copy(dumpit);
                __copy(done);
 #undef __copy
-               ops[i].ops.doit = nl_doit_wrapper;
+               if (ops[i].doit)
+                       ops[i].ops.doit = nl_doit_wrapper;
                ret = genl_register_ops(&family->family, &ops[i].ops);
                if (ret < 0)
                        goto error_ops;