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From: Arnd Bergmann <arnd@arndb.de>
To: linux-kernel@vger.kernel.org,
	Johannes Berg <johannes.berg@intel.com>,
	Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
	Luca Coelho <luciano.coelho@intel.com>,
	Intel Linux Wireless <linuxwifi@intel.com>,
	Kalle Valo <kvalo@codeaurora.org>,
	"David S. Miller" <davem@davemloft.net>,
	Sara Sharon <sara.sharon@intel.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Andrei Otcheretianski <andrei.otcheretianski@intel.com>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH 02/15] iwlwifi: mvm: fix gcc-10 zero-length-bounds warning
Date: Thu, 30 Apr 2020 23:30:44 +0200	[thread overview]
Message-ID: <20200430213101.135134-3-arnd@arndb.de> (raw)
In-Reply-To: <20200430213101.135134-1-arnd@arndb.de>

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>
---
 drivers/net/wireless/intel/iwlwifi/fw/api/tx.h | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h b/drivers/net/wireless/intel/iwlwifi/fw/api/tx.h
index f1d1fe96fecc..82d59b5a5f8c 100644
--- 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 {
-- 
2.26.0


  parent reply	other threads:[~2020-04-30 21:32 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-30 21:30 [PATCH 00/15] gcc-10 warning fixes Arnd Bergmann
2020-04-30 21:30 ` [PATCH 01/15] crypto - Avoid free() namespace collision Arnd Bergmann
2020-05-08  6:06   ` Herbert Xu
2020-04-30 21:30 ` Arnd Bergmann [this message]
2020-06-10 12:18   ` [PATCH 02/15] iwlwifi: mvm: fix gcc-10 zero-length-bounds warning Luciano Coelho
2020-04-30 21:30 ` [PATCH 03/15] mwifiex: avoid -Wstringop-overflow warning Arnd Bergmann
2020-05-06  8:43   ` Kalle Valo
2020-04-30 21:30 ` [PATCH 04/15] ath10k: fix gcc-10 zero-length-bounds warnings Arnd Bergmann
2020-04-30 21:45   ` Gustavo A. R. Silva
2020-04-30 21:44     ` Arnd Bergmann
2020-05-04 11:54     ` Kalle Valo
2020-05-04 16:09       ` Gustavo A. R. Silva
2020-05-05  4:56         ` Kalle Valo
2020-04-30 21:30 ` [PATCH 05/15] bpf: avoid gcc-10 stringop-overflow warning Arnd Bergmann
2020-05-04 21:06   ` Daniel Borkmann
2020-04-30 21:30 ` [PATCH 06/15] netfilter: conntrack: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-05-10 21:48   ` Pablo Neira Ayuso
2020-04-30 21:30 ` [PATCH 07/15] drop_monitor: work around gcc-10 stringop-overflow warning Arnd Bergmann
2020-05-01 11:28   ` Neil Horman
2020-04-30 21:30 ` [PATCH 08/15] usb: ehci: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-05-01  2:42   ` Alan Stern
2020-05-01 20:06     ` Arnd Bergmann
2020-05-01 20:10       ` Alan Stern
2020-04-30 21:30 ` [PATCH 09/15] udf: avoid gcc-10 zero-length-bounds warnings Arnd Bergmann
2020-04-30 21:54   ` Pali Rohár
2020-05-01 20:30     ` Arnd Bergmann
2020-05-01 20:48       ` Jan Kara
2020-05-01 20:57       ` Pali Rohár
2020-04-30 21:30 ` [PATCH 10/15] hpfs: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-04-30 21:30 ` [PATCH 11/15] omfs: avoid gcc-10 stringop-overflow warning Arnd Bergmann
2020-04-30 21:30 ` [PATCH 12/15] media: s5k5baf: avoid gcc-10 zero-length-bounds warning Arnd Bergmann
2020-04-30 21:46   ` Gustavo A. R. Silva
2020-04-30 21:30 ` [PATCH 13/15] scsi: sas: " Arnd Bergmann
2020-05-01  7:47   ` John Garry
2020-05-01  7:54     ` Arnd Bergmann
2020-05-01 14:53       ` James Bottomley
2020-05-01 17:36         ` Arnd Bergmann
2020-04-30 21:30 ` [PATCH 14/15] isci: " Arnd Bergmann
2020-04-30 21:30 ` [PATCH 15/15] nvme: " Arnd Bergmann
2020-05-01  7:32   ` Christoph Hellwig

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