From fbfc8502af526578039dc89426224943d199c019 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Mon, 17 Feb 2020 14:02:36 -0600 Subject: net: switchdev: 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 Signed-off-by: David S. Miller --- net/switchdev/switchdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'net/switchdev') diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c index 3a1d428c1336..60630762a748 100644 --- a/net/switchdev/switchdev.c +++ b/net/switchdev/switchdev.c @@ -29,7 +29,7 @@ struct switchdev_deferred_item { struct list_head list; struct net_device *dev; switchdev_deferred_func_t *func; - unsigned long data[0]; + unsigned long data[]; }; static struct switchdev_deferred_item *switchdev_deferred_dequeue(void) -- cgit v1.2.3