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bpo-40880: Fix invalid read in newline_in_string in pegen.c (GH-20666)

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* bpo-40880: Fix invalid read in newline_in_string in pegen.c

* Update Parser/pegen/pegen.c

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>

* Add NEWS entry

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
(cherry picked from commit 2e6593db00)

Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>
This commit is contained in:
Miss Islington (bot) 2020-06-05 17:13:14 -07:00 • committed by GitHub
parent 79e6c15aed
commit 15fec5627a
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2 changed files with 4 additions and 2 deletions
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2
Misc/NEWS.d/next/Core and Builtins/2020-06-06-00-23-19.bpo-40880.fjdzSh.rst Normal file
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@ -0,0 +1,2 @@
Fix invalid memory read in the new parser when checking newlines in string
literals. Patch by Pablo Galindo.

4
Parser/pegen/pegen.c
View file

@ -936,8 +936,8 @@ _PyPegen_number_token(Parser *p)
static int // bool
newline_in_string(Parser *p, const char *cur)
{
for (char c = *cur; cur >= p->tok->buf; c = *--cur) {
if (c == '\'' || c == '"') {
for (const char *c = cur; c >= p->tok->buf; c--) {
if (*c == '\'' || *c == '"') {
return 1;
}
}