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struct sockaddr_un can be truncated.

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When we have "struct sockaddr_un *s_un", we could not assume *s_un
points to a memory region which size is at least sizeof(*s_un).
Even worse, it may be shorter than sizeof(struct sockaddr) on some
systems.
This commit is contained in:
Tomoyuki Sahara
2018-06-14 13:28:32 +09:00
parent 3618556a95
commit 5013d2b20f
1 changed files with 5 additions and 1 deletions
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mrbgems/mruby-socket/src/socket.c
+5 -1
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@@ -214,7 +214,11 @@ mrb_addrinfo_unix_path(mrb_state *mrb, mrb_value self)
sastr = mrb_iv_get(mrb, self, mrb_intern_lit(mrb, "@sockaddr"));
if (((struct sockaddr *)RSTRING_PTR(sastr))->sa_family != AF_UNIX)
mrb_raise(mrb, E_SOCKET_ERROR, "need AF_UNIX address");
return mrb_str_new_cstr(mrb, ((struct sockaddr_un *)RSTRING_PTR(sastr))->sun_path);
if (RSTRING_LEN(sastr) < offsetof(struct sockaddr_un, sun_path) + 1) {
return mrb_str_new(mrb, "", 0);
} else {
return mrb_str_new_cstr(mrb, ((struct sockaddr_un *)RSTRING_PTR(sastr))->sun_path);
}
}
#endif