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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-03-20 02:05:25 +0300 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2020-03-23 20:18:27 +0300 |
| commit | 0562ebcf054afae5100782ba082355be0495b04d (patch) | |
| tree | e1eb547b5bd6a61c12f6e073f3643ab350ae3a51 /drivers/net/wireless | |
| parent | b0c40588161dafdafdbac537b4441be02c15aff2 (diff) | |
| download | linux-0562ebcf054afae5100782ba082355be0495b04d.tar.xz | |
ray_cs: Replace zero-length array with flexible-array member
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@embeddedor.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200319230525.GA14835@embeddedor.com
Diffstat (limited to 'drivers/net/wireless')
| -rw-r--r-- | drivers/net/wireless/rayctl.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/rayctl.h b/drivers/net/wireless/rayctl.h index 668444f6bf07..2b0f332043d7 100644 --- a/drivers/net/wireless/rayctl.h +++ b/drivers/net/wireless/rayctl.h @@ -570,7 +570,7 @@ struct phy_header { }; struct ray_rx_msg { struct mac_header mac; - UCHAR var[0]; + UCHAR var[]; }; struct tx_msg { |