hardening fixes for v6.5-rc6

- Replace remaining open-coded struct_size_t() instance (Gustavo A. R. Silva)
 
 - Adjust vboxsf's trailing arrays to be proper flexible arrays
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Merge tag 'hardening-v6.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull hardening fixes from Kees Cook:

 - Replace remaining open-coded struct_size_t() instance (Gustavo A. R.
   Silva)

 - Adjust vboxsf's trailing arrays to be proper flexible arrays

* tag 'hardening-v6.5-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  media: venus: Use struct_size_t() helper in pkt_session_unset_buffers()
  vboxsf: Use flexible arrays for trailing string member

drivers/media/platform/qcom/venus/hfi_cmds.c

@@ -251,8 +251,8 @@ int pkt_session_unset_buffers(struct hfi_session_release_buffer_pkt *pkt,
 
 		pkt->extradata_size = 0;
 		pkt->shdr.hdr.size =
-			struct_size((struct hfi_session_set_buffers_pkt *)0,
-				    buffer_info, bd->num_buffers);
+			struct_size_t(struct hfi_session_set_buffers_pkt,
+				      buffer_info, bd->num_buffers);
 	}
 
 	pkt->response_req = bd->response_required;

fs/vboxsf/shfl_hostintf.h

@@ -68,9 +68,9 @@ struct shfl_string {
 
 	/** UTF-8 or UTF-16 string. Nul terminated. */
 	union {
-		u8 utf8[2];
-		u16 utf16[1];
-		u16 ucs2[1]; /* misnomer, use utf16. */
+		u8 legacy_padding[2];
+		DECLARE_FLEX_ARRAY(u8, utf8);
+		DECLARE_FLEX_ARRAY(u16, utf16);
 	} string;
 };
 VMMDEV_ASSERT_SIZE(shfl_string, 6);