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bpo-40020: Fix realloc leak on failure in growable_comment_array_add (GH-19083)

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Fix a leak and subsequent crash in parsetok.c caused by realloc misuse on a rare codepath. 

Realloc returns a null pointer on failure, and then growable_comment_array_deallocate crashes later when it dereferences it.
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Alexander Riccio 2020-03-30 17:15:59 -04:00 committed by GitHub
parent fc2d8d62af
commit 51e3e450fb
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2 changed files with 6 additions and 3 deletions
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1
Misc/NEWS.d/next/Core and Builtins/2020-03-19-21-53-41.bpo-40020.n-26G7.rst Normal file
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@ -0,0 +1 @@
Fix a leak and subsequent crash in parsetok.c caused by realloc misuse on a rare codepath.

8
Parser/parsetok.c
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@ -37,11 +37,13 @@ growable_comment_array_init(growable_comment_array *arr, size_t initial_size) {
static int
growable_comment_array_add(growable_comment_array *arr, int lineno, char *comment) {
if (arr->num_items >= arr->size) {
arr->size *= 2;
arr->items = realloc(arr->items, arr->size * sizeof(*arr->items));
if (!arr->items) {
size_t new_size = arr->size * 2;
void *new_items_array = realloc(arr->items, new_size * sizeof(*arr->items));
if (!new_items_array) {
return 0;
}
arr->items = new_items_array;
arr->size = new_size;
}
arr->items[arr->num_items].lineno = lineno;