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* [PATCH] PCI: hv: Replace zero-length array with flexible-array member
@ 2020-02-13  0:50 Gustavo A. R. Silva
  2020-02-13  3:43 ` Dexuan Cui
  0 siblings, 1 reply; 2+ messages in thread
From: Gustavo A. R. Silva @ 2020-02-13  0:50 UTC (permalink / raw)
  To: K. Y. Srinivasan, Haiyang Zhang, Stephen Hemminger, Sasha Levin,
	Lorenzo Pieralisi, Andrew Murray, Bjorn Helgaas
  Cc: linux-hyperv, linux-pci, 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/pci/controller/pci-hyperv.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 9977abff92fc..be957268f9d6 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -260,7 +260,7 @@ struct pci_packet {
 				int resp_packet_size);
 	void *compl_ctxt;
 
-	struct pci_message message[0];
+	struct pci_message message[];
 };
 
 /*
@@ -296,7 +296,7 @@ struct pci_bus_d0_entry {
 struct pci_bus_relations {
 	struct pci_incoming_message incoming;
 	u32 device_count;
-	struct pci_function_description func[0];
+	struct pci_function_description func[];
 } __packed;
 
 struct pci_q_res_req_response {
@@ -508,7 +508,7 @@ struct hv_dr_work {
 struct hv_dr_state {
 	struct list_head list_entry;
 	u32 device_count;
-	struct pci_function_description func[0];
+	struct pci_function_description func[];
 };
 
 enum hv_pcichild_state {
-- 
2.23.0


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

* RE: [PATCH] PCI: hv: Replace zero-length array with flexible-array member
  2020-02-13  0:50 [PATCH] PCI: hv: Replace zero-length array with flexible-array member Gustavo A. R. Silva
@ 2020-02-13  3:43 ` Dexuan Cui
  0 siblings, 0 replies; 2+ messages in thread
From: Dexuan Cui @ 2020-02-13  3:43 UTC (permalink / raw)
  To: Gustavo A. R. Silva, KY Srinivasan, Haiyang Zhang,
	Stephen Hemminger, Sasha Levin, Lorenzo Pieralisi, Andrew Murray,
	Bjorn Helgaas
  Cc: linux-hyperv, linux-pci, linux-kernel

> From: linux-hyperv-owner@vger.kernel.org
> <linux-hyperv-owner@vger.kernel.org> On Behalf Of Gustavo A. R. Silva
> Sent: Wednesday, February 12, 2020 4:51 PM
>  ...
> 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.

Looks good to me. Thanks, Gustavo!
 
Reviewed-by: Dexuan Cui <decui@microsoft.com>

FWIW, it looks there are a lot of more to fix in the kernel tree: the below
commands return 1373 for me:

grep -nr '\[0\];$' * | grep '\.h:' | grep -v = | wc -l

Running the commands against the kernel/ directory returns 3.

Thanks,
-- Dexuan

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

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2020-02-13  0:50 [PATCH] PCI: hv: Replace zero-length array with flexible-array member Gustavo A. R. Silva
2020-02-13  3:43 ` Dexuan Cui

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