ND_TTEST2 --- can l be negative

[Michael Richardson <mcr () sandelman ca>]

What do you think of this patch.
I was trying to use ND_TTEST2() in a place where l was seemingly to become
negative, and I felt that we should check for that situation.
In the situation at hand, that actually wasn't the problem, but I still think
that perhaps this is a good thing.


--- a/netdissect.h
+++ b/netdissect.h
@@ -271,8 +271,9 @@ struct netdissect_options {
  *     http://www.kb.cert.org/vuls/id/162289
    */
     #define ND_TTEST2(var, l) \
     +  ((l) >= 0 && \
             ((uintptr_t)ndo->ndo_snapend - (l) <=
(uintptr_t)ndo->ndo_snapend && \
-           (uintptr_t)&(var) <= (uintptr_t)ndo->ndo_snapend - (l))
+         (uintptr_t)&(var) <= (uintptr_t)ndo->ndo_snapend - (l)))

 /* True if "var" was captured */
  #define ND_TTEST(var) ND_TTEST2(var, sizeof(var))
  

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