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add theoretical nsubs size limit

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Kyryl Melekhin
2021-09-07 18:46:21 +00:00
parent 55e0ec31ac
commit 6b37292d0f
1 changed files with 7 additions and 1 deletions
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8
pike.c
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@@ -537,12 +537,18 @@ int re_pikevm(rcode *prog, const char *s, const char **subp, int nsubp)
{
int i, j, c, gen, subidx = 1, *npc;
int rsubsize = sizeof(rsub)+(sizeof(char*)*nsubp);
int nsubssize = rsubsize * (prog->len+3 - prog->splits);
int clistidx = 0, nlistidx = 0;
const char *sp = s, *_sp = s;
int *insts = prog->insts;
int *pcs[prog->splits];
rsub *subs[prog->splits];
char nsubs[rsubsize * (prog->len+3 - prog->splits)];
/* Although worst case scenario nsubs size is prog->len,
with moderate sized regexes it is easy to stack overflow
here. Most of the time only very small portion of memory
is actually used, but it is necessary to cover all cases
and posible paths, as it is nondeterministic. */
char nsubs[nsubssize > 500000 ? 500000 : nsubssize];
rsub *nsub, *s1, *matched = NULL, *freesub = NULL;
rthread _clist[prog->len], _nlist[prog->len];
rthread *clist = _clist, *nlist = _nlist, *tmp;