[PATCH] wifi: libertas: use variable-size data in assoc req/resp cmd

[Johannes Berg <johannes@xxxxxxxxxxxxxxxx>]

From: Johannes Berg <johannes.berg@xxxxxxxxx>

The firmware has a 512 limit here, but we use less, so gcc
starts complaining about it:

drivers/net/wireless/marvell/libertas/cfg.c:1198:63: warning: array subscript ‘struct cmd_ds_802_11_associate_response[0]’ is partly outside array bounds of ‘unsigned char[203]’ [-Warray-bounds]
 1198 |                       "aid 0x%04x\n", status, le16_to_cpu(resp->statuscode),
      |                                                               ^~

Since we size the command and response buffer per our needs
and not per the firmware maximum, change to a variable size
data array and put the 512 only into a comment.

In the end, that's actually what the code always wanted, and
it simplifies the code that used to subtract the fixed size
buffer size in two places.

Reported-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
 drivers/net/wireless/marvell/libertas/cfg.c  | 4 +---
 drivers/net/wireless/marvell/libertas/host.h | 6 ++++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/marvell/libertas/cfg.c b/drivers/net/wireless/marvell/libertas/cfg.c
index 4e3de684928b..b0b3f59dabc6 100644
--- a/drivers/net/wireless/marvell/libertas/cfg.c
+++ b/drivers/net/wireless/marvell/libertas/cfg.c
@@ -1053,7 +1053,6 @@ static int lbs_set_authtype(struct lbs_private *priv,
  */
 #define LBS_ASSOC_MAX_CMD_SIZE                     \
 	(sizeof(struct cmd_ds_802_11_associate)    \
-	 - 512 /* cmd_ds_802_11_associate.iebuf */ \
 	 + LBS_MAX_SSID_TLV_SIZE                   \
 	 + LBS_MAX_CHANNEL_TLV_SIZE                \
 	 + LBS_MAX_CF_PARAM_TLV_SIZE               \
@@ -1130,8 +1129,7 @@ static int lbs_associate(struct lbs_private *priv,
 	if (sme->ie && sme->ie_len)
 		pos += lbs_add_wpa_tlv(pos, sme->ie, sme->ie_len);
 
-	len = (sizeof(*cmd) - sizeof(cmd->iebuf)) +
-		(u16)(pos - (u8 *) &cmd->iebuf);
+	len = sizeof(*cmd) + (u16)(pos - (u8 *) &cmd->iebuf);
 	cmd->hdr.size = cpu_to_le16(len);
 
 	lbs_deb_hex(LBS_DEB_ASSOC, "ASSOC_CMD", (u8 *) cmd,
diff --git a/drivers/net/wireless/marvell/libertas/host.h b/drivers/net/wireless/marvell/libertas/host.h
index ceff4b92e7a1..a202b716ad5d 100644
--- a/drivers/net/wireless/marvell/libertas/host.h
+++ b/drivers/net/wireless/marvell/libertas/host.h
@@ -528,7 +528,8 @@ struct cmd_ds_802_11_associate {
 	__le16 listeninterval;
 	__le16 bcnperiod;
 	u8 dtimperiod;
-	u8 iebuf[512];    /* Enough for required and most optional IEs */
+	/* 512 permitted - enough for required and most optional IEs */
+	u8 iebuf[];
 } __packed;
 
 struct cmd_ds_802_11_associate_response {
@@ -537,7 +538,8 @@ struct cmd_ds_802_11_associate_response {
 	__le16 capability;
 	__le16 statuscode;
 	__le16 aid;
-	u8 iebuf[512];
+	/* max 512 */
+	u8 iebuf[];
 } __packed;
 
 struct cmd_ds_802_11_set_wep {
-- 
2.36.1