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netdissect.h: Update ND_TTEST2 to fix issue 443

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Add IS_NOT_NEGATIVE macro.
Avoid these warnings:
- comparison of unsigned expression >= 0 is always true [-Wtype-limits],
- comparison is always true due to limited range of data type [-Wtype-limits].
This commit is contained in:
Francois-Xavier Le Bail 2015-04-27 18:20:59 +02:00
parent 599b0311e0
commit cab33b7a0a
1 changed files with 4 additions and 1 deletions
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netdissect.h
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@ -270,8 +270,11 @@ struct netdissect_options {
*
* http://www.kb.cert.org/vuls/id/162289
*/
#define IS_NOT_NEGATIVE(x) (((x) > 0) || ((x) == 0))
#define ND_TTEST2(var, l) \
((l) >= 0 && \
(IS_NOT_NEGATIVE(l) && \
((uintptr_t)ndo->ndo_snapend - (l) <= (uintptr_t)ndo->ndo_snapend && \
(uintptr_t)&(var) <= (uintptr_t)ndo->ndo_snapend - (l)))