carl9170: Replace zero-length array of trailing structs with flex-array

Zero-length arrays are deprecated[1] and are being replaced with
flexible array members in support of the ongoing efforts to tighten the
FORTIFY_SOURCE routines on memcpy(), correctly instrument array indexing
with UBSAN_BOUNDS, and to globally enable -fstrict-flex-arrays=3.

Replace zero-length array with flexible-array member.

This results in no differences in binary output.

[1] https://github.com/KSPP/linux/issues/78

Cc: Christian Lamparter <chunkeey@googlemail.com>
Cc: Kalle Valo <kvalo@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Paolo Abeni <pabeni@redhat.com>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

diff --git a/include/shared/fwcmd.h b/include/shared/fwcmd.h
index 4a500095555c67d9baea63c6ffe41e4839c13996..ff4b3b50250c673425ea61e0d00708c629972e02 100644 (file)
--- a/include/shared/fwcmd.h
+++ b/include/shared/fwcmd.h
@@ -118,10 +118,10 @@ struct carl9170_reg_list {
 } __packed;
 
 struct carl9170_write_reg {
-       struct {
+       DECLARE_FLEX_ARRAY(struct {
                __le32          addr;
                __le32          val;
-       } regs[0] __packed;
+       } __packed, regs);
 } __packed;
 
 struct carl9170_write_reg_byte {