https://github.com/python/cpython/commit/c45e661226558e997e265cf53ce1419213cc10b7
commit: c45e661226558e997e265cf53ce1419213cc10b7
branch: main
author: naya451 <[email protected]>
committer: gpshead <[email protected]>
date: 2025-05-19T08:10:23-07:00
summary:
gh-131505: Move len boundary assertions before using len. (#131536)
Move len boundary assertions before using len.
files:
M Modules/_io/bytesio.c
diff --git a/Modules/_io/bytesio.c b/Modules/_io/bytesio.c
index 4cde5f87032a3f..61cfec435fe60f 100644
--- a/Modules/_io/bytesio.c
+++ b/Modules/_io/bytesio.c
@@ -607,9 +607,9 @@ _io_BytesIO_readinto_impl(bytesio *self, Py_buffer *buffer)
len = 0;
}
- memcpy(buffer->buf, PyBytes_AS_STRING(self->buf) + self->pos, len);
assert(self->pos + len < PY_SSIZE_T_MAX);
assert(len >= 0);
+ memcpy(buffer->buf, PyBytes_AS_STRING(self->buf) + self->pos, len);
self->pos += len;
return PyLong_FromSsize_t(len);
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