diff options
| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-02-24 18:03:55 -0600 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-02-26 16:43:09 -0800 |
| commit | 4a34d825b8939606c3a318341a9de7a4e4d350e7 (patch) | |
| tree | 97ac9ac3e99179ec7db540db296fe4a27f608907 /drivers/net/ethernet/qlogic/netxen | |
| parent | 3f02735e5da5367e4cd563ce6e5c21ce27922248 (diff) | |
| download | linux-4a34d825b8939606c3a318341a9de7a4e4d350e7.tar.bz2 | |
qlogic: 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 detected 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/net/ethernet/qlogic/netxen')
| -rw-r--r-- | drivers/net/ethernet/qlogic/netxen/netxen_nic.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/qlogic/netxen/netxen_nic.h b/drivers/net/ethernet/qlogic/netxen/netxen_nic.h index 3dce769d83a1..86153660d245 100644 --- a/drivers/net/ethernet/qlogic/netxen/netxen_nic.h +++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic.h @@ -1316,7 +1316,7 @@ struct netxen_minidump_template_hdr { u32 driver_info_word4; u32 saved_state_array[NX_DUMP_STATE_ARRAY_LEN]; u32 capture_size_array[NX_DUMP_CAP_SIZE_ARRAY_LEN]; - u32 rsvd[0]; + u32 rsvd[]; }; /* Common Entry Header: Common to All Entry Types */ |