divide by zero in random/taviso()

[Vince Weaver <vincent.weaver@xxxxxxxxx>]

Hello

so for my perf_fuzzer I re-use the trinity random.c, and today I hit

[ 1241.026870] traps: perf_fuzzer[4509] trap divide error ip:40a779 

which maps to the taviso() routine which is doing:

           case 1: r = rand() % rand();
#if __WORDSIZE == 64
                r <<= 32;
                r |= rand() % rand();
#endif
                break;

which is a divide by zero if rand() returns 0.

Is there a good way to fix this short of a lot of special case checks?

Vince Weaver
vincent.weaver@xxxxxxxxx
http://www.eece.maine.edu/~vweaver/
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