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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-03-20 17:13:23 -0500
committerDominik Brodowski <linux@dominikbrodowski.net>2020-03-28 07:52:13 +0100
commitaf741b0bad237bf85d388b70c62dfcb2769beef0 (patch)
tree54fe4da7fa76419e8dcb201ad3957191576a3a6b /drivers/pcmcia
parent1e6709b352e7432289d6384213d5222f8d8f8fdf (diff)
downloadlinux-af741b0bad237bf85d388b70c62dfcb2769beef0.tar.bz2
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.h2
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 {