iwlwifi: mvm: fix gcc-10 zero-length-bounds warning

gcc-10 complains when a zero-length array is accessed:

drivers/net/wireless/intel/iwlwifi/mvm/tx.c: In function 'iwl_mvm_rx_ba_notif':
drivers/net/wireless/intel/iwlwifi/mvm/tx.c:1929:17: warning: array subscript 9 is outside the bounds of an interior zero-length array 'struct iwl_mvm_compressed_ba_tfd[0]' [-Wzero-length-bounds]
 1929 |     &ba_res->tfd[i];
      |      ~~~~~~~~~~~^~~
In file included from drivers/net/wireless/intel/iwlwifi/mvm/../fw/api/tdls.h:68,
                 from drivers/net/wireless/intel/iwlwifi/mvm/fw-api.h:68,
                 from drivers/net/wireless/intel/iwlwifi/mvm/sta.h:73,
                 from drivers/net/wireless/intel/iwlwifi/mvm/mvm.h:83,
                 from drivers/net/wireless/intel/iwlwifi/mvm/tx.c:72:
drivers/net/wireless/intel/iwlwifi/mvm/../fw/api/tx.h:769:35: note: while referencing 'tfd'
  769 |  struct iwl_mvm_compressed_ba_tfd tfd[0];
      |                                   ^~~

Change this structure to use a flexible-array member for 'tfd' instead,
along with the various structures using an zero-length ieee80211_hdr
array that do not show warnings today but might be affected by similar
issues in the future.

Fixes: 6f68cc367ab6 ("iwlwifi: api: annotate compressed BA notif array sizes")
Fixes: c46e7724bfe9 ("iwlwifi: mvm: support new BA notification response")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20200430213101.135134-3-arnd@arndb.de
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h b/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h
index f1d1fe96fecc4a2fdb734929839d0c7fbb5e869f..82d59b5a5f8c0dd12acd81fc0ee369deaa58c298 100644 (file)
--- a/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h
@@ -293,7 +293,7 @@ struct iwl_tx_cmd {
        __le16 pm_frame_timeout;
        __le16 reserved4;
        u8 payload[0];
-       struct ieee80211_hdr hdr[0];
+       struct ieee80211_hdr hdr[];
 } __packed; /* TX_CMD_API_S_VER_6 */
 
 struct iwl_dram_sec_info {
@@ -319,7 +319,7 @@ struct iwl_tx_cmd_gen2 {
        __le32 flags;
        struct iwl_dram_sec_info dram_info;
        __le32 rate_n_flags;
-       struct ieee80211_hdr hdr[0];
+       struct ieee80211_hdr hdr[];
 } __packed; /* TX_CMD_API_S_VER_7 */
 
 /**
@@ -342,7 +342,7 @@ struct iwl_tx_cmd_gen3 {
        struct iwl_dram_sec_info dram_info;
        __le32 rate_n_flags;
        __le64 ttl;
-       struct ieee80211_hdr hdr[0];
+       struct ieee80211_hdr hdr[];
 } __packed; /* TX_CMD_API_S_VER_8 */
 
 /*
@@ -766,8 +766,8 @@ struct iwl_mvm_compressed_ba_notif {
        __le32 tx_rate;
        __le16 tfd_cnt;
        __le16 ra_tid_cnt;
-       struct iwl_mvm_compressed_ba_tfd tfd[0];
        struct iwl_mvm_compressed_ba_ratid ra_tid[0];
+       struct iwl_mvm_compressed_ba_tfd tfd[];
 } __packed; /* COMPRESSED_BA_RES_API_S_VER_4 */
 
 /**
@@ -784,7 +784,7 @@ struct iwl_mac_beacon_cmd_v6 {
        __le32 template_id;
        __le32 tim_idx;
        __le32 tim_size;
-       struct ieee80211_hdr frame[0];
+       struct ieee80211_hdr frame[];
 } __packed; /* BEACON_TEMPLATE_CMD_API_S_VER_6 */
 
 /**
@@ -805,7 +805,7 @@ struct iwl_mac_beacon_cmd_v7 {
        __le32 tim_size;
        __le32 ecsa_offset;
        __le32 csa_offset;
-       struct ieee80211_hdr frame[0];
+       struct ieee80211_hdr frame[];
 } __packed; /* BEACON_TEMPLATE_CMD_API_S_VER_7 */
 
 enum iwl_mac_beacon_flags {
@@ -840,7 +840,7 @@ struct iwl_mac_beacon_cmd {
        __le32 tim_size;
        __le32 ecsa_offset;
        __le32 csa_offset;
-       struct ieee80211_hdr frame[0];
+       struct ieee80211_hdr frame[];
 } __packed; /* BEACON_TEMPLATE_CMD_API_S_VER_10 */
 
 struct iwl_beacon_notif {