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bpo-45820: Fix a segfault when the parser fails without reading any input (GH-29580)

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Pablo Galindo Salgado 2021-11-16 19:51:52 +00:00 • committed by GitHub
parent 9d6215a54c
commit df4ae55e66
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Misc/NEWS.d/next/Core and Builtins/2021-11-16-19-00-27.bpo-45820.2X6Psr.rst Normal file
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@ -0,0 +1,2 @@
Fix a segfault when the parser fails without reading any input. Patch by
Pablo Galindo

8
Parser/pegen.c
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@ -368,6 +368,14 @@ tokenizer_error(Parser *p)
void * void *
_PyPegen_raise_error(Parser *p, PyObject *errtype, const char *errmsg, ...) _PyPegen_raise_error(Parser *p, PyObject *errtype, const char *errmsg, ...)
{ {
if (p->fill == 0) {
va_list va;
va_start(va, errmsg);
_PyPegen_raise_error_known_location(p, errtype, 0, 0, 0, -1, errmsg, va);
va_end(va);
return NULL;
}
Token *t = p->known_err_token != NULL ? p->known_err_token : p->tokens[p->fill - 1]; Token *t = p->known_err_token != NULL ? p->known_err_token : p->tokens[p->fill - 1];
Py_ssize_t col_offset; Py_ssize_t col_offset;
Py_ssize_t end_col_offset = -1; Py_ssize_t end_col_offset = -1;