bpo-30205: Fix getsockname() for unbound AF_UNIX sockets on Linux (#1370)
* bpo-30205: Fix getsockname() for unbound AF_UNIX sockets on Linux
* Add NEWS entry
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index 6d5c256..456c664 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -1211,9 +1211,9 @@
{
struct sockaddr_un *a = (struct sockaddr_un *) addr;
#ifdef __linux__
- if (a->sun_path[0] == 0) { /* Linux abstract namespace */
- addrlen -= offsetof(struct sockaddr_un, sun_path);
- return PyBytes_FromStringAndSize(a->sun_path, addrlen);
+ size_t linuxaddrlen = addrlen - offsetof(struct sockaddr_un, sun_path);
+ if (linuxaddrlen > 0 && a->sun_path[0] == 0) { /* Linux abstract namespace */
+ return PyBytes_FromStringAndSize(a->sun_path, linuxaddrlen);
}
else
#endif /* linux */