| Message ID | 20200213011258.GA14874@embeddedor.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Jason Gunthorpe |
| Headers | show |
| Series | IB/multicast: Replace zero-length array with flexible-array member | expand |
diff --git a/drivers/infiniband/core/multicast.c b/drivers/infiniband/core/multicast.c index cd338ddc4a39..9c2d8b7f1af9 100644 --- a/drivers/infiniband/core/multicast.c +++ b/drivers/infiniband/core/multicast.c @@ -71,7 +71,7 @@ struct mcast_device { struct ib_event_handler event_handler; int start_port; int end_port; - struct mcast_port port[0]; + struct mcast_port port[]; }; enum mcast_state {
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> --- drivers/infiniband/core/multicast.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)