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 <[email protected]>
---
CC: [email protected]
CC: [email protected]
CC: [email protected]
---
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
On 20/05/2022 21:43, Jakub Kicinski wrote:
> 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 <[email protected]>
Acked-by: Christian Lamparter <[email protected]>