[PATCH 1/7] nwfilter: fix NULL pointer check in virNWFilterSnoopReqNew

[Ján Tomko <jtomko@xxxxxxxxxx>]

This can't lead to a crash since virNWFilterSnoopReqNew is only called
with a static array as the argument, but if we check for NULL we should
do it right.
---
 src/nwfilter/nwfilter_dhcpsnoop.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/nwfilter/nwfilter_dhcpsnoop.c b/src/nwfilter/nwfilter_dhcpsnoop.c
index 807fd28..7703efd 100644
--- a/src/nwfilter/nwfilter_dhcpsnoop.c
+++ b/src/nwfilter/nwfilter_dhcpsnoop.c
@@ -573,12 +573,12 @@ virNWFilterSnoopReqNew(const char *ifkey)
 {
     virNWFilterSnoopReqPtr req;
 
-    if (ifkey == NULL || strlen(ifkey) != VIR_IFKEY_LEN - 1) {
+    if (ifkey == NULL || (ifkey && strlen(ifkey) != VIR_IFKEY_LEN - 1)) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("virNWFilterSnoopReqNew called with invalid "
                          "key \"%s\" (%zu)"),
                        ifkey ? ifkey : "",
-                       strlen(ifkey));
+                       ifkey ? strlen(ifkey) : 0);
         return NULL;
     }
 
-- 
1.7.8.6

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