treewide: Replace 0-element memcpy() destinations with flexible arrays

The 0-element arrays that are used as memcpy() destinations are actually
flexible arrays. Adjust their structures accordingly so that memcpy()
can better reason able their destination size (i.e. they need to be seen
as "unknown" length rather than "zero").

In some cases, use of the DECLARE_FLEX_ARRAY() helper is needed when a
flexible array is alone in a struct.

Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Nilesh Javali <njavali@marvell.com>
Cc: Manish Rangankar <mrangankar@marvell.com>
Cc: GR-QLogic-Storage-Upstream@marvell.com
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Larry Finger <Larry.Finger@lwfinger.net>
Cc: Phillip Potter <phil@philpotter.co.uk>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Florian Schilhabel <florian.c.schilhabel@googlemail.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Cc: Fabio Aiuto <fabioaiuto83@gmail.com>
Cc: Ross Schmidt <ross.schm.dev@gmail.com>
Cc: Marco Cesati <marcocesati@gmail.com>
Cc: ath10k@lists.infradead.org
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Cc: linux-scsi@vger.kernel.org
Cc: linux-staging@lists.linux.dev
Signed-off-by: Kees Cook <keescook@chromium.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/net/wireless/ath/ath10k/bmi.h b/drivers/net/wireless/ath/ath10k/bmi.h
index f6fadcbdd86e..0685c0d2d4ea 100644
--- a/drivers/net/wireless/ath/ath10k/bmi.h
+++ b/drivers/net/wireless/ath/ath10k/bmi.h
@@ -109,7 +109,7 @@ struct bmi_cmd {
 		struct {
 			__le32 addr;
 			__le32 len;
-			u8 payload[0];
+			u8 payload[];
 		} write_mem;
 		struct {
 			__le32 addr;
@@ -138,18 +138,18 @@ struct bmi_cmd {
 		} rompatch_uninstall;
 		struct {
 			__le32 count;
-			__le32 patch_ids[0]; /* length of @count */
+			__le32 patch_ids[]; /* length of @count */
 		} rompatch_activate;
 		struct {
 			__le32 count;
-			__le32 patch_ids[0]; /* length of @count */
+			__le32 patch_ids[]; /* length of @count */
 		} rompatch_deactivate;
 		struct {
 			__le32 addr;
 		} lz_start;
 		struct {
 			__le32 len; /* max BMI_MAX_DATA_SIZE */
-			u8 payload[0]; /* length of @len */
+			u8 payload[]; /* length of @len */
 		} lz_data;
 		struct {
 			u8 name[BMI_NVRAM_SEG_NAME_SZ];
@@ -160,7 +160,7 @@ struct bmi_cmd {
 
 union bmi_resp {
 	struct {
-		u8 payload[0];
+		DECLARE_FLEX_ARRAY(u8, payload);
 	} read_mem;
 	struct {
 		__le32 result;