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R. Silva" To: Felix Fietkau , Lorenzo Bianconi , Ryder Lee , Shayne Chen , Sean Wang , Kalle Valo , Matthias Brugger , AngeloGioacchino Del Regno Cc: linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, "Gustavo A. R. Silva" , linux-hardening@vger.kernel.org Subject: [PATCH v2][wireless-next/for-next] wifi: mt76: mt7996: Use DECLARE_FLEX_ARRAY() and fix -Warray-bounds warnings Message-ID: MIME-Version: 1.0 Content-Disposition: inline X-Spam-Status: No, score=-1.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Tue, 12 Dec 2023 09:14:37 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1785097126346363186 X-GMAIL-MSGID: 1785097126346363186 Transform zero-length arrays `rate`, `adm_stat` and `msdu_cnt` into proper flexible-array members in anonymous union in `struct mt7996_mcu_all_sta_info_event` via the DECLARE_FLEX_ARRAY() helper; and fix multiple -Warray-bounds warnings: drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:544:61: warning: array subscript is outside array bounds of 'struct [0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:551:58: warning: array subscript is outside array bounds of 'struct [0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:553:58: warning: array subscript is outside array bounds of 'struct [0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:530:61: warning: array subscript is outside array bounds of 'struct [0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:538:66: warning: array subscript is outside array bounds of 'struct [0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:540:66: warning: array subscript is outside array bounds of 'struct [0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:520:57: warning: array subscript is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:526:76: warning: array subscript is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:526:76: warning: array subscript is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:526:76: warning: array subscript is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=] drivers/net/wireless/mediatek/mt76/mt7996/mcu.c:526:76: warning: array subscript is outside array bounds of 'struct all_sta_trx_rate[0]' [-Warray-bounds=] This results in no differences in binary output, helps with the ongoing efforts to globally enable -Warray-bounds. Reviewed-by: Kees Cook Signed-off-by: Gustavo A. R. Silva --- Changes in v2: - Add Kees' RB tag. - Transform zero-length array `rate` into flex-array member. - Address five more -Warray-bounds warnings introduced by fake flexible array `rate` drivers/net/wireless/mediatek/mt76/mt7996/mcu.h | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h index 3e013b20ee5e..36cacc495c75 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h +++ b/drivers/net/wireless/mediatek/mt76/mt7996/mcu.h @@ -206,20 +206,20 @@ struct mt7996_mcu_all_sta_info_event { u8 rsv3[4]; union { - struct all_sta_trx_rate rate[0]; - struct { + DECLARE_FLEX_ARRAY(struct all_sta_trx_rate, rate); + DECLARE_FLEX_ARRAY(struct { __le16 wlan_idx; u8 rsv[2]; __le32 tx_bytes[IEEE80211_NUM_ACS]; __le32 rx_bytes[IEEE80211_NUM_ACS]; - } adm_stat[0] __packed; + } __packed, adm_stat); - struct { + DECLARE_FLEX_ARRAY(struct { __le16 wlan_idx; u8 rsv[2]; __le32 tx_msdu_cnt; __le32 rx_msdu_cnt; - } msdu_cnt[0] __packed; + } __packed, msdu_cnt); } __packed; } __packed;