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Merge branch 'uniquetid_overflow_fix' of https://github.com/edward-san/zdoom

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This commit is contained in:
Christoph Oelckers 2014-01-16 11:38:53 +01:00
commit af3e619232
2 changed files with 11 additions and 7 deletions
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2
src/p_acs.cpp
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@ -4934,7 +4934,7 @@ int DLevelScript::CallFunction(int argCount, int funcIndex, SDWORD *args, const
break;
case ACSF_UniqueTID:
return P_FindUniqueTID(argCount > 0 ? args[0] : 0, argCount > 1 ? args[1] : 0);
return P_FindUniqueTID(argCount > 0 ? args[0] : 0, (argCount > 1 && args[1] >= 0) ? args[1] : 0);
case ACSF_IsTIDUsed:
return P_IsTIDUsed(args[0]);

16
src/p_mobj.cpp
View file

@ -2726,12 +2726,16 @@ int P_FindUniqueTID(int start_tid, int limit)
if (start_tid != 0)
{ // Do a linear search.
limit = start_tid + limit - 1;
if (limit < start_tid)
{ // If it overflowed, clamp to INT_MAX
limit = INT_MAX;
int end_tid = start_tid;
if (start_tid > 0 && limit > INT_MAX - start_tid + 1)
{ // If 'limit+start_tid-1' overflows, clamp 'end_tid' to INT_MAX
end_tid = INT_MAX;
}
for (tid = start_tid; tid <= limit; ++tid)
else
{
end_tid += limit-1;
}
for (tid = start_tid; tid <= end_tid; ++tid)
{
if (tid != 0 && !P_IsTIDUsed(tid))
{
@ -2769,7 +2773,7 @@ CCMD(utid)
{
Printf("%d\n",
P_FindUniqueTID(argv.argc() > 1 ? atoi(argv[1]) : 0,
argv.argc() > 2 ? atoi(argv[2]) : 0));
(argv.argc() > 2 && atoi(argv[2]) >= 0) ? atoi(argv[2]) : 0));
}
//==========================================================================