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crash fix in PR_ExecuteProgram()

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This commit is contained in:
Yan Sweitzer 2000-05-14 20:29:32 +00:00
parent bfbfc01491
commit f1dab8604b
1 changed files with 25 additions and 2 deletions
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27
source/pr_exec.c
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@ -400,10 +400,33 @@ while (1)
s++; // next statement
st = &pr_statements[s];
a = (eval_t *)&pr_globals[st->a];
// NUM_GLOBALS in Mega2K qwprogs.dat got too big and crashes the server
// offsets are bigger than 32767 but encoded as signed shorts, resulting
// in negative indexs in pr_globals[], specifically with big maps such as
// frontlin.bsp. Since all arrays are static and contiguous in memory
// (one single alloc), data gets overwritten:
//
// pr_statements[60793].c = -32690
// c = (eval_t *) &pr_globals[-32690];
// c->_int = xxx overwrites the content of pr_functions[87]
//
// FIXME: this is a dirty crash fix. go 32 bits in progs.dat
if (st->a & 0x8000) ofsa = (int)st->a + 0xFFFF; else ofsa = st->a;
if (st->b & 0x8000) ofsb = (int)st->b + 0xFFFF; else ofsb = st->b;
if (st->c & 0x8000) ofsc = (int)st->c + 0xFFFF; else ofsc = st->c;
a = (eval_t *)&pr_globals[ofsa];
b = (eval_t *)&pr_globals[ofsb];
c = (eval_t *)&pr_globals[ofsc];
/*
a = (eval_t *)&pr_globals[st->a];
b = (eval_t *)&pr_globals[st->b];
c = (eval_t *)&pr_globals[st->c];
*/
if (--runaway == 0)
PR_RunError ("runaway loop error");