The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@xxxxxxxxxxxxxx>
---
drivers/net/wireless/st/cw1200/wsm.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/wireless/st/cw1200/wsm.h b/drivers/net/wireless/st/cw1200/wsm.h
index ddea57f8c8ab..1ffa47994bb9 100644
--- a/drivers/net/wireless/st/cw1200/wsm.h
+++ b/drivers/net/wireless/st/cw1200/wsm.h
@@ -1623,7 +1623,7 @@ struct wsm_p2p_device_info {
u8 local_devname[D11_MAX_SSID_LEN];
u8 reserved2[3];
u8 num_secdev_supported;
- struct wsm_p2p_device_type secdevs[0];
+ struct wsm_p2p_device_type secdevs[];
} __packed;
/* 4.36 SetWCDMABand - WO */
--
2.25.0
