libipt_REDIRECT: avoid dereference of uninitialized pointer

When using --to-ports with a port name instead of a numerical
specification, a segfault occurs.

References: http://bugzilla.netfilter.org/show_bug.cgi?id=691
Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

diff --git a/extensions/libipt_REDIRECT.c b/extensions/libipt_REDIRECT.c
index 4760e655a2d8aaf7b1663ac3bc5698ce3e8be8ae..74b3aa13217d1f895dc04a22567549e852241be0 100644 (file)
--- a/extensions/libipt_REDIRECT.c
+++ b/extensions/libipt_REDIRECT.c
@@ -41,7 +41,7 @@ static void REDIRECT_init(struct xt_entry_target *t)
 static void
 parse_ports(const char *arg, struct nf_nat_multi_range *mr)
 {
-       char *end;
+       char *end = "";
        unsigned int port, maxport;
 
        mr->range[0].flags |= IP_NAT_RANGE_PROTO_SPECIFIED;