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| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-03-21 01:13:23 +0300 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2020-03-28 09:52:13 +0300 |
| commit | af741b0bad237bf85d388b70c62dfcb2769beef0 (patch) | |
| tree | 54fe4da7fa76419e8dcb201ad3957191576a3a6b /drivers/pcmcia | |
| parent | 1e6709b352e7432289d6384213d5222f8d8f8fdf (diff) | |
| download | linux-af741b0bad237bf85d388b70c62dfcb2769beef0.tar.xz | |
pcmcia: soc_common.h: 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: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'drivers/pcmcia')
| -rw-r--r-- | drivers/pcmcia/soc_common.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/pcmcia/soc_common.h b/drivers/pcmcia/soc_common.h index b7f993f1bbd0..222e81c79365 100644 --- a/drivers/pcmcia/soc_common.h +++ b/drivers/pcmcia/soc_common.h @@ -88,7 +88,7 @@ struct soc_pcmcia_socket { struct skt_dev_info { int nskt; - struct soc_pcmcia_socket skt[0]; + struct soc_pcmcia_socket skt[]; }; struct pcmcia_state { |