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fnematch: fix out-of-bounds access on EOF #211

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fnematch: fix out-of-bounds access on EOF #211

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12 changes: 7 additions & 5 deletions b.c
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Original file line number Diff line number Diff line change
Expand Up @@ -850,13 +850,15 @@ bool fnematch(fa *pfa, FILE *f, char **pbuf, int *pbufsize, int quantum)
j = i++;
do {
r = getrune(f);
if ((++j + r.len) >= k) {
if (k >= bufsize)
if (!adjbuf((char **) &buf, &bufsize, bufsize+1, quantum, 0, "fnematch"))
FATAL("stream '%.30s...' too long", buf);
if (r.len == 0) {
r.len = 1; // store NUL byte for EOF
}
j += r.len;
if (j >= bufsize) {
if (!adjbuf((char **) &buf, &bufsize, j+1, quantum, 0, "fnematch"))
FATAL("stream '%.30s...' too long", buf);
}
memcpy(buf + k, r.bytes, r.len);
j += r.len - 1; // incremented next time around the loop
k += r.len;

if ((ns = get_gototab(pfa, s, r.rune)) != 0)
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