net: ip6_fib: 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")

---
 include/net/ip6_fib.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index fd60a8ac02ee..6ec26e4d7f11 100644
@@ -198,7 +198,7 @@ struct fib6_info {
 
 	struct rcu_head			rcu;
 	struct nexthop			*nh;
-	struct fib6_nh			fib6_nh[0];
+	struct fib6_nh			fib6_nh[];
 };
 
 struct rt6_info {

2.25.0

From: "Gustavo A. R. Silva" <[email protected]>
Date: Mon, 2 Mar 2020 06:06:07 -0600

Applied.