dmanegine: ioat/dca: Replace zero-length array with flexible-array member
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Message ID 20200214171302.GA20586@embeddedor
State Accepted
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  • dmanegine: ioat/dca: Replace zero-length array with flexible-array member
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Commit Message

Gustavo A. R. Silva Feb. 14, 2020, 5:13 p.m. UTC
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/ioat/dca.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Vinod Koul Feb. 19, 2020, 12:18 p.m. UTC | #1
On 14-02-20, 11:13, 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

Patch
diff mbox series

diff --git a/drivers/dma/ioat/dca.c b/drivers/dma/ioat/dca.c
index be61c32a876f..0be385587c4c 100644
--- a/drivers/dma/ioat/dca.c
+++ b/drivers/dma/ioat/dca.c
@@ -102,7 +102,7 @@  struct ioat_dca_priv {
 	int			 max_requesters;
 	int			 requester_count;
 	u8			 tag_map[IOAT_TAG_MAP_LEN];
-	struct ioat_dca_slot 	 req_slots[0];
+	struct ioat_dca_slot	 req_slots[];
 };
 
 static int ioat_dca_dev_managed(struct dca_provider *dca,