netdev - [PATCH][next] bna: bnad: Replace zero-length array with flexible-array member

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Message-ID: <20200302121051.GA28820@embeddedor>
Date:   Mon, 2 Mar 2020 06:10:51 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Rasesh Mody <rmody@...vell.com>,
        Sudarsana Kalluru <skalluru@...vell.com>,
        "GR-Linux-NIC-Dev@...vell.com David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH][next] bna: bnad: 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@...eddedor.com>
---
 drivers/net/ethernet/brocade/bna/bnad.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/brocade/bna/bnad.h b/drivers/net/ethernet/brocade/bna/bnad.h
index 492a02d54f14..bfa58b40dc3f 100644
--- a/drivers/net/ethernet/brocade/bna/bnad.h
+++ b/drivers/net/ethernet/brocade/bna/bnad.h
@@ -253,7 +253,7 @@ struct bnad_rx_unmap_q {
 	int			alloc_order;
 	u32			map_size;
 	enum bnad_rxbuf_type	type;
-	struct bnad_rx_unmap	unmap[0] ____cacheline_aligned;
+	struct bnad_rx_unmap	unmap[] ____cacheline_aligned;
 };
 
 #define BNAD_PCI_DEV_IS_CAT2(_bnad) \
-- 
2.25.0