diff options
| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-03-19 17:50:02 -0500 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2020-03-23 19:16:11 +0200 |
| commit | 98d13639e6950b31e2e2e596a9bb58dada8b9f29 (patch) | |
| tree | c1d8a1828d3c3404a4585af5751b60ea5b1f97e7 /drivers/net/wireless/admtek | |
| parent | 432eb89c61746c41fc5ab61de1666365155d67e4 (diff) | |
adm80211: 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/20200319225002.GA28673@embeddedor.com
Diffstat (limited to 'drivers/net/wireless/admtek')
| -rw-r--r-- | drivers/net/wireless/admtek/adm8211.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/wireless/admtek/adm8211.h b/drivers/net/wireless/admtek/adm8211.h index 2c55c629de28..095625ecb8ff 100644 --- a/drivers/net/wireless/admtek/adm8211.h +++ b/drivers/net/wireless/admtek/adm8211.h @@ -531,7 +531,7 @@ struct adm8211_eeprom { u8 lpf_cutoff[14]; /* 0x62 */ u8 lnags_threshold[14]; /* 0x70 */ __le16 checksum; /* 0x7E */ - u8 cis_data[0]; /* 0x80, 384 bytes */ + u8 cis_data[]; /* 0x80, 384 bytes */ } __packed; struct adm8211_priv { |