summaryrefslogtreecommitdiffstats
path: root/include
diff options
context:
space:
mode:
authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-28 19:05:02 -0600
committerDavid S. Miller <davem@davemloft.net>2020-02-29 21:52:20 -0800
commit08ca27d027c238ed3f9b9968d349cebde44d99a6 (patch)
tree16da06932c89de8b052eb889f5750240790275a4 /include
parent8661b6e7c46408bb6a74d3a1d77ce9af35f584d8 (diff)
downloadlinux-08ca27d027c238ed3f9b9968d349cebde44d99a6.tar.bz2
neighbour: 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: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/net/neighbour.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 8ec77bfdc1a4..e1476775769c 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -174,7 +174,7 @@ struct pneigh_entry {
struct net_device *dev;
u8 flags;
u8 protocol;
- u8 key[0];
+ u8 key[];
};
/*