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gh-105235: Prevent reading outside buffer during mmap.find() (#105252)

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* Add a special case for s[-m:] == p in _PyBytes_Find

* Add tests for _PyBytes_Find

* Make sure that start <= end in mmap.find
This commit is contained in:
Dennis Sweeney 2023-07-12 22:50:45 -04:00 • committed by GitHub
parent 2d43beec22
commit ab86426a34
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5 changed files with 161 additions and 3 deletions
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7
Modules/mmapmodule.c
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@ -342,12 +342,17 @@ mmap_gfind(mmap_object *self,
Py_ssize_t res;
CHECK_VALID_OR_RELEASE(NULL, view);
if (reverse) {
if (end < start) {
res = -1;
}
else if (reverse) {
assert(0 <= start && start <= end && end <= self->size);
res = _PyBytes_ReverseFind(
self->data + start, end - start,
view.buf, view.len, start);
}
else {
assert(0 <= start && start <= end && end <= self->size);
res = _PyBytes_Find(
self->data + start, end - start,
view.buf, view.len, start);