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* [PATCH] dmaengine: bcm-sba-raid: Replace zero-length array with flexible-array member
@ 2020-02-13  0:37 Gustavo A. R. Silva
  2020-02-13 14:46 ` Vinod Koul
  0 siblings, 1 reply; 2+ messages in thread
From: Gustavo A. R. Silva @ 2020-02-13  0:37 UTC (permalink / raw)
  To: Dan Williams, Vinod Koul; +Cc: dmaengine, linux-kernel, Gustavo A. R. Silva

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/dma/bcm-sba-raid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/bcm-sba-raid.c b/drivers/dma/bcm-sba-raid.c
index 275e90fa829d..64239da02e74 100644
--- a/drivers/dma/bcm-sba-raid.c
+++ b/drivers/dma/bcm-sba-raid.c
@@ -120,7 +120,7 @@ struct sba_request {
 	struct brcm_message msg;
 	struct dma_async_tx_descriptor tx;
 	/* SBA commands */
-	struct brcm_sba_command cmds[0];
+	struct brcm_sba_command cmds[];
 };
 
 enum sba_version {
-- 
2.23.0


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH] dmaengine: bcm-sba-raid: Replace zero-length array with flexible-array member
  2020-02-13  0:37 [PATCH] dmaengine: bcm-sba-raid: Replace zero-length array with flexible-array member Gustavo A. R. Silva
@ 2020-02-13 14:46 ` Vinod Koul
  0 siblings, 0 replies; 2+ messages in thread
From: Vinod Koul @ 2020-02-13 14:46 UTC (permalink / raw)
  To: Gustavo A. R. Silva; +Cc: Dan Williams, dmaengine, linux-kernel

On 12-02-20, 18:37, Gustavo A. R. Silva wrote:
> 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.

Applied, thanks

-- 
~Vinod

^ permalink raw reply	[flat|nested] 2+ messages in thread

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2020-02-13  0:37 [PATCH] dmaengine: bcm-sba-raid: Replace zero-length array with flexible-array member Gustavo A. R. Silva
2020-02-13 14:46 ` Vinod Koul

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