net: marvell: 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>

diff --git a/drivers/net/ethernet/marvell/skge.h b/drivers/net/ethernet/marvell/skge.h
index 6fa7b6a..a1313d5 100644 (file)
--- a/drivers/net/ethernet/marvell/skge.h
+++ b/drivers/net/ethernet/marvell/skge.h
@@ -2426,7 +2426,7 @@ struct skge_hw {
        spinlock_t           phy_lock;
        struct tasklet_struct phy_task;
 
-       char                 irq_name[0]; /* skge@pci:000:04:00.0 */
+       char                 irq_name[]; /* skge@pci:000:04:00.0 */
 };
 
 enum pause_control {

diff --git a/drivers/net/ethernet/marvell/sky2.h b/drivers/net/ethernet/marvell/sky2.h
index b02b652..ada1ca6 100644 (file)
--- a/drivers/net/ethernet/marvell/sky2.h
+++ b/drivers/net/ethernet/marvell/sky2.h
@@ -2309,7 +2309,7 @@ struct sky2_hw {
        struct work_struct   restart_work;
        wait_queue_head_t    msi_wait;
 
-       char                 irq_name[0];
+       char                 irq_name[];
 };
 
 static inline int sky2_is_copper(const struct sky2_hw *hw)