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bpo-42150: Avoid buffer overflow in the new parser (GH-22978)

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Pablo Galindo 2020-10-25 23:03:41 +00:00 • committed by GitHub
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Misc/NEWS.d/next/Core and Builtins/2020-10-25-21-14-18.bpo-42150.b70u_T.rst Normal file
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@ -0,0 +1,2 @@
Fix possible buffer overflow in the new parser when checking for
continuation lines. Patch by Pablo Galindo.

3
Parser/pegen.c
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@ -990,7 +990,8 @@ bad_single_statement(Parser *p)
/* Newlines are allowed if preceded by a line continuation character /* Newlines are allowed if preceded by a line continuation character
or if they appear inside a string. */ or if they appear inside a string. */
if (!cur || *(cur - 1) == '\\' || newline_in_string(p, cur)) { if (!cur || (cur != p->tok->buf && *(cur - 1) == '\\')
|| newline_in_string(p, cur)) {
return 0; return 0;
} }
char c = *cur; char c = *cur;