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Message-ID: <aZLgfO6z1Gt8aiyc@kspp>
Date: Mon, 16 Feb 2026 18:16:44 +0900
From: "Gustavo A. R. Silva" <gustavoars@...nel.org>
To: Stanislaw Gruszka <stf_xl@...pl>,
Johannes Berg <johannes@...solutions.net>
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
"Gustavo A. R. Silva" <gustavoars@...nel.org>,
linux-hardening@...r.kernel.org, Kees Cook <kees@...nel.org>
Subject: [PATCH v3][next] wifi: iwlegacy: Avoid multiple
-Wflex-array-member-not-at-end warnings
-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.
Move the conflicting declarations (which in a couple of cases happen
to be in a union, so the entire unions are moved) to the end of the
corresponding structures, struct il_frame, and struct il3945_frame.
Notice that `struct il_tx_beacon_cmd`, `struct il4965_tx_resp`, and
`struct il3945_tx_beacon_cmd` are flexible structures, this is
structures that contain a flexible-array member.
The case for struct il4965_beacon_notif is different. Since this
structure is defined by hardware, we create the new `struct
il4965_tx_resp_hdr` type. We then use this newly created type to
replace the object type causing trouble in struct il4965_beacon_notif,
namely `stryct il4965_tx_resp`.
Also, once -fms-extensions is enabled, we can use transparent struct
members in struct il4965_beacon_notif.
Notice that the newly created type does not contain the flex-array
member `agg_status`, which is the object causing the -Wfamnae warnings.
This object is currently in a union along with `__le32 status`, so
anything using struct il4965_beacon_notif needs to have its own view
of `status`. To preserve the memory layout, we therefore add member
`__le32 beacon_tx_status` to struct il4965_beacon_notif.
After these changes, the size of struct il4965_beacon_notif along
with its member's offsets remain the same, hence the memory layout
doesn't change:
Before changes:
struct il4965_beacon_notif {
struct il4965_tx_resp beacon_notify_hdr; /* 0 24 */
__le32 low_tsf; /* 24 4 */
__le32 high_tsf; /* 28 4 */
__le32 ibss_mgr_status; /* 32 4 */
/* size: 36, cachelines: 1, members: 4 */
/* last cacheline: 36 bytes */
};
After changes:
struct il4965_beacon_notif {
struct il4965_tx_resp_hdr beacon_notify_hdr; /* 0 20 */
__le32 beacon_tx_status; /* 20 4 */
__le32 low_tsf; /* 24 4 */
__le32 high_tsf; /* 28 4 */
__le32 ibss_mgr_status; /* 32 4 */
/* size: 36, cachelines: 1, members: 5 */
/* last cacheline: 36 bytes */
};
Lastly, adjust the rest of the code, accordingly.
With these changes fix the following warnings:
11 drivers/net/wireless/intel/iwlegacy/common.h:526:11: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
11 drivers/net/wireless/intel/iwlegacy/commands.h:2667:31: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
4 drivers/net/wireless/intel/iwlegacy/3945.h:131:11: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
Changes in v3:
- Create new separate struct il4965_tx_resp_hdr, and use
transparent struct members instead of __struct_group(). (Kees)
- Update subject line - Add 'wifi:' prefix. (Stanislaw)
Changes in v2:
- Use the struct_group() helper, and update the conflicting type
(struct il4965_tx_resp -> struct il4965_tx_resp_hdr) in
struct il4965_beacon_notif.
- Link: https://lore.kernel.org/linux-hardening/aYlkt2WP2oQ1TgeH@kspp/
v1:
- Link: https://lore.kernel.org/linux-hardening/aR2CtqZI3atH0HmE@kspp/
drivers/net/wireless/intel/iwlegacy/3945.h | 4 +++-
drivers/net/wireless/intel/iwlegacy/4965-mac.c | 2 +-
drivers/net/wireless/intel/iwlegacy/commands.h | 9 +++++++--
drivers/net/wireless/intel/iwlegacy/common.h | 4 +++-
4 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/drivers/net/wireless/intel/iwlegacy/3945.h b/drivers/net/wireless/intel/iwlegacy/3945.h
index fb1e33c89d0e..ed63b31fee9a 100644
--- a/drivers/net/wireless/intel/iwlegacy/3945.h
+++ b/drivers/net/wireless/intel/iwlegacy/3945.h
@@ -123,13 +123,15 @@ enum il3945_antenna {
#define IEEE80211_FRAME_LEN (IEEE80211_DATA_LEN + IEEE80211_HLEN)
struct il3945_frame {
+ struct list_head list;
+
+ /* Must be last as it ends in a flexible-array member. */
union {
struct ieee80211_hdr frame;
struct il3945_tx_beacon_cmd beacon;
u8 raw[IEEE80211_FRAME_LEN];
u8 cmd[360];
} u;
- struct list_head list;
};
#define SUP_RATE_11A_MAX_NUM_CHANNELS 8
diff --git a/drivers/net/wireless/intel/iwlegacy/4965-mac.c b/drivers/net/wireless/intel/iwlegacy/4965-mac.c
index 57fa866efd9f..f5a99a2ee95a 100644
--- a/drivers/net/wireless/intel/iwlegacy/4965-mac.c
+++ b/drivers/net/wireless/intel/iwlegacy/4965-mac.c
@@ -4076,7 +4076,7 @@ il4965_hdl_beacon(struct il_priv *il, struct il_rx_buf *rxb)
u8 rate = il4965_hw_get_rate(beacon->beacon_notify_hdr.rate_n_flags);
D_RX("beacon status %x retries %d iss %d tsf:0x%.8x%.8x rate %d\n",
- le32_to_cpu(beacon->beacon_notify_hdr.u.status) & TX_STATUS_MSK,
+ le32_to_cpu(beacon->beacon_tx_status) & TX_STATUS_MSK,
beacon->beacon_notify_hdr.failure_frame,
le32_to_cpu(beacon->ibss_mgr_status),
le32_to_cpu(beacon->high_tsf), le32_to_cpu(beacon->low_tsf), rate);
diff --git a/drivers/net/wireless/intel/iwlegacy/commands.h b/drivers/net/wireless/intel/iwlegacy/commands.h
index b61b8f377702..7aba84ac88a1 100644
--- a/drivers/net/wireless/intel/iwlegacy/commands.h
+++ b/drivers/net/wireless/intel/iwlegacy/commands.h
@@ -1690,7 +1690,7 @@ struct agg_tx_status {
__le16 sequence;
} __packed;
-struct il4965_tx_resp {
+struct il4965_tx_resp_hdr {
u8 frame_count; /* 1 no aggregation, >1 aggregation */
u8 bt_kill_count; /* # blocked by bluetooth (unused for agg) */
u8 failure_rts; /* # failures due to unsuccessful RTS */
@@ -1707,6 +1707,10 @@ struct il4965_tx_resp {
__le16 reserved;
__le32 pa_power1; /* RF power amplifier measurement (not used) */
__le32 pa_power2;
+} __packed;
+
+struct il4965_tx_resp {
+ struct il4965_tx_resp_hdr;
/*
* For non-agg: frame status TX_STATUS_*
@@ -2664,7 +2668,8 @@ struct il3945_beacon_notif {
} __packed;
struct il4965_beacon_notif {
- struct il4965_tx_resp beacon_notify_hdr;
+ struct il4965_tx_resp_hdr beacon_notify_hdr;
+ __le32 beacon_tx_status;
__le32 low_tsf;
__le32 high_tsf;
__le32 ibss_mgr_status;
diff --git a/drivers/net/wireless/intel/iwlegacy/common.h b/drivers/net/wireless/intel/iwlegacy/common.h
index 4c9836ab11dd..21f1c7702add 100644
--- a/drivers/net/wireless/intel/iwlegacy/common.h
+++ b/drivers/net/wireless/intel/iwlegacy/common.h
@@ -518,13 +518,15 @@ struct il_channel_info {
#define IEEE80211_FRAME_LEN (IEEE80211_DATA_LEN + IEEE80211_HLEN)
struct il_frame {
+ struct list_head list;
+
+ /* Must be last as it ends in a flexible-array member. */
union {
struct ieee80211_hdr frame;
struct il_tx_beacon_cmd beacon;
u8 raw[IEEE80211_FRAME_LEN];
u8 cmd[360];
} u;
- struct list_head list;
};
enum {
--
2.43.0
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