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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-03-20 02:06:17 +0300 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2020-03-23 20:21:21 +0300 |
| commit | 53efdc9cb9e6a6f693a81da005280df92b813933 (patch) | |
| tree | eb1be54443b3b899514ca5d8166e095113e7f77b /drivers/net/wireless/wl3501.h | |
| parent | 0562ebcf054afae5100782ba082355be0495b04d (diff) | |
| download | linux-53efdc9cb9e6a6f693a81da005280df92b813933.tar.xz | |
wl3501_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/20200319230617.GA15035@embeddedor.com
Diffstat (limited to 'drivers/net/wireless/wl3501.h')
| -rw-r--r-- | drivers/net/wireless/wl3501.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/wl3501.h b/drivers/net/wireless/wl3501.h index efdce9ae36ea..b446cb369557 100644 --- a/drivers/net/wireless/wl3501.h +++ b/drivers/net/wireless/wl3501.h @@ -231,7 +231,7 @@ struct iw_mgmt_info_element { u8 id; /* one of enum iw_mgmt_info_element_ids, but sizeof(enum) > sizeof(u8) :-( */ u8 len; - u8 data[0]; + u8 data[]; } __packed; struct iw_mgmt_essid_pset { |