rateest: guard against segfault

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/extensions/libxt_rateest.c b/extensions/libxt_rateest.c
index ebea43763fe042446036fac9f44fadb4c7d4c54e..333239d98cf92135bdf8ab692914d2e17ff9f093 100644 (file)
--- a/extensions/libxt_rateest.c
+++ b/extensions/libxt_rateest.c
@@ -306,6 +306,9 @@ rateest_final_check(unsigned int flags)
 {
        struct xt_rateest_match_info *info = rateest_info;
 
+       if (info == NULL)
+               exit_error(PARAMETER_PROBLEM, "rateest match: "
+                          "you need to specify some flags");
        if (!(info->flags & XT_RATEEST_MATCH_REL))
                info->flags |= XT_RATEEST_MATCH_ABS;
 }