netdev - [PATCH net-next 8/8] wifi: carl9170: silence a GCC 12 -Warray-bounds warning

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Message-Id: <20220520194320.2356236-9-kuba@kernel.org>
Date:   Fri, 20 May 2022 12:43:20 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     kvalo@...nel.org, johannes@...solutions.net
Cc:     netdev@...r.kernel.org, linux-wireless@...r.kernel.org,
        Jakub Kicinski <kuba@...nel.org>, chunkeey@...glemail.com
Subject: [PATCH net-next 8/8] wifi: carl9170: silence a GCC 12 -Warray-bounds warning

carl9170 has a big union (struct carl9170_cmd) with all the command
types in it. But it allocates buffers only large enough for a given
command. This upsets GCC 12:

drivers/net/wireless/ath/carl9170/cmd.c:125:30: warning: array subscript ‘struct carl9170_cmd[0]’ is partly outside array bounds of ‘unsigned char[8]’ [-Warray-bounds]
  125 |                 tmp->hdr.cmd = cmd;
      |                 ~~~~~~~~~~~~~^~~~~

Punt the warning to W=1 for now. Hopefully GCC will learn to
recognize which fields are in-bounds.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
CC: chunkeey@...glemail.com
CC: kvalo@...nel.org
CC: linux-wireless@...r.kernel.org
---
 drivers/net/wireless/ath/carl9170/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/ath/carl9170/Makefile b/drivers/net/wireless/ath/carl9170/Makefile
index 1a81868ce26d..7463baa62fa8 100644
--- a/drivers/net/wireless/ath/carl9170/Makefile
+++ b/drivers/net/wireless/ath/carl9170/Makefile
@@ -3,3 +3,8 @@ carl9170-objs := main.o usb.o cmd.o mac.o phy.o led.o fw.o tx.o rx.o
 carl9170-$(CONFIG_CARL9170_DEBUGFS) += debug.o
 
 obj-$(CONFIG_CARL9170) += carl9170.o
+
+# FIXME: temporarily silence -Warray-bounds on non W=1+ builds
+ifndef KBUILD_EXTRA_WARN
+CFLAGS_cmd.o += -Wno-array-bounds
+endif
-- 
2.34.3