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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-03-02 15:19:53 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-03-02 22:16:28 +0300 |
| commit | 0fcf4666431fcc42e96c48d72a56b284c30d6254 (patch) | |
| tree | 06700a4c3dd26819e83823a647befa49ccd42d59 /drivers | |
| parent | 8f5c69f96a5030899437e3e76dc4495c99e2258a (diff) | |
| download | linux-0fcf4666431fcc42e96c48d72a56b284c30d6254.tar.xz | |
net: atlantic: 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: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.h b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.h index 42f0c5c6ec2d..6b4f701e7006 100644 --- a/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.h +++ b/drivers/net/ethernet/aquantia/atlantic/hw_atl/hw_atl_utils.h @@ -225,7 +225,7 @@ struct __packed offload_info { struct offload_port_info ports; struct offload_ka_info kas; struct offload_rr_info rrs; - u8 buf[0]; + u8 buf[]; }; struct __packed hw_atl_utils_fw_rpc { |