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>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 6377ef97d7739310d54e4dd5deb848bfa52c2432..6e3fc249040f0b7ee388364baa2833c6d9150721 100644 (file)
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -1145,7 +1145,7 @@ struct ieee80211_mgmt {
                        __le16 auth_transaction;
                        __le16 status_code;
                        /* possibly followed by Challenge text */
-                       u8 variable[0];
+                       u8 variable[];
                } __packed __aligned(4) auth;
                struct {
                        __le16 reason_code;
@@ -1154,26 +1154,26 @@ struct ieee80211_mgmt {
                        __le16 capab_info;
                        __le16 listen_interval;
                        /* followed by SSID and Supported rates */
-                       u8 variable[0];
+                       u8 variable[];
                } __packed __aligned(4) assoc_req;
                struct {
                        __le16 capab_info;
                        __le16 status_code;
                        __le16 aid;
                        /* followed by Supported rates */
-                       u8 variable[0];
+                       u8 variable[];
                } __packed __aligned(4) assoc_resp, reassoc_resp;
                struct {
                        __le16 capab_info;
                        __le16 status_code;
-                       u8 variable[0];
+                       u8 variable[];
                } __packed __aligned(4) s1g_assoc_resp, s1g_reassoc_resp;
                struct {
                        __le16 capab_info;
                        __le16 listen_interval;
                        u8 current_ap[6];
                        /* followed by SSID and Supported rates */
-                       u8 variable[0];
+                       u8 variable[];
                } __packed __aligned(4) reassoc_req;
                struct {
                        __le16 reason_code;
@@ -1184,11 +1184,11 @@ struct ieee80211_mgmt {
                        __le16 capab_info;
                        /* followed by some of SSID, Supported rates,
                         * FH Params, DS Params, CF Params, IBSS Params, TIM */
-                       u8 variable[0];
+                       u8 variable[];
                } __packed __aligned(4) beacon;
                struct {
                        /* only variable items: SSID, Supported rates */
-                       u8 variable[0];
+                       DECLARE_FLEX_ARRAY(u8, variable);
                } __packed __aligned(4) probe_req;
                struct {
                        __le64 timestamp;
@@ -1196,7 +1196,7 @@ struct ieee80211_mgmt {
                        __le16 capab_info;
                        /* followed by some of SSID, Supported rates,
                         * FH Params, DS Params, CF Params, IBSS Params */
-                       u8 variable[0];
+                       u8 variable[];
                } __packed __aligned(4) probe_resp;
                struct {
                        u8 category;
@@ -1205,16 +1205,16 @@ struct ieee80211_mgmt {
                                        u8 action_code;
                                        u8 dialog_token;
                                        u8 status_code;
-                                       u8 variable[0];
+                                       u8 variable[];
                                } __packed wme_action;
                                struct{
                                        u8 action_code;
-                                       u8 variable[0];
+                                       u8 variable[];
                                } __packed chan_switch;
                                struct{
                                        u8 action_code;
                                        struct ieee80211_ext_chansw_ie data;
-                                       u8 variable[0];
+                                       u8 variable[];
                                } __packed ext_chan_switch;
                                struct{
                                        u8 action_code;
@@ -1230,7 +1230,7 @@ struct ieee80211_mgmt {
                                        __le16 timeout;
                                        __le16 start_seq_num;
                                        /* followed by BA Extension */
-                                       u8 variable[0];
+                                       u8 variable[];
                                } __packed addba_req;
                                struct{
                                        u8 action_code;
@@ -1246,11 +1246,11 @@ struct ieee80211_mgmt {
                                } __packed delba;
                                struct {
                                        u8 action_code;
-                                       u8 variable[0];
+                                       u8 variable[];
                                } __packed self_prot;
                                struct{
                                        u8 action_code;
-                                       u8 variable[0];
+                                       u8 variable[];
                                } __packed mesh_action;
                                struct {
                                        u8 action;
@@ -1294,7 +1294,7 @@ struct ieee80211_mgmt {
                                        u8 toa[6];
                                        __le16 tod_error;
                                        __le16 toa_error;
-                                       u8 variable[0];
+                                       u8 variable[];
                                } __packed ftm;
                                struct {
                                        u8 action_code;