* [PATCH] Input: cyapa - replace zero-length array with flexible-array member
@ 2020-02-14 17:21 Gustavo A. R. Silva
2020-02-15 23:30 ` Dmitry Torokhov
0 siblings, 1 reply; 2+ messages in thread
From: Gustavo A. R. Silva @ 2020-02-14 17:21 UTC (permalink / raw)
To: Dmitry Torokhov; +Cc: linux-input, 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/input/mouse/cyapa_gen5.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/input/mouse/cyapa_gen5.c b/drivers/input/mouse/cyapa_gen5.c
index 14239fbd72cf..7f012bfa2658 100644
--- a/drivers/input/mouse/cyapa_gen5.c
+++ b/drivers/input/mouse/cyapa_gen5.c
@@ -250,7 +250,7 @@ struct cyapa_tsg_bin_image_data_record {
struct cyapa_tsg_bin_image {
struct cyapa_tsg_bin_image_head image_head;
- struct cyapa_tsg_bin_image_data_record records[0];
+ struct cyapa_tsg_bin_image_data_record records[];
} __packed;
struct pip_bl_packet_start {
@@ -271,7 +271,7 @@ struct pip_bl_cmd_head {
u8 report_id; /* Bootloader output report id, must be 40h */
u8 rsvd; /* Reserved, must be 0 */
struct pip_bl_packet_start packet_start;
- u8 data[0]; /* Command data variable based on commands */
+ u8 data[]; /* Command data variable based on commands */
} __packed;
/* Initiate bootload command data structure. */
@@ -300,7 +300,7 @@ struct tsg_bl_metadata_row_params {
struct tsg_bl_flash_row_head {
u8 flash_array_id;
__le16 flash_row_id;
- u8 flash_data[0];
+ u8 flash_data[];
} __packed;
struct pip_app_cmd_head {
@@ -314,7 +314,7 @@ struct pip_app_cmd_head {
* Bit 6-0: command code.
*/
u8 cmd_code;
- u8 parameter_data[0]; /* Parameter data variable based on cmd_code */
+ u8 parameter_data[]; /* Parameter data variable based on cmd_code */
} __packed;
/* Application get/set parameter command data structure */
--
2.25.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] Input: cyapa - replace zero-length array with flexible-array member
2020-02-14 17:21 [PATCH] Input: cyapa - replace zero-length array with flexible-array member Gustavo A. R. Silva
@ 2020-02-15 23:30 ` Dmitry Torokhov
0 siblings, 0 replies; 2+ messages in thread
From: Dmitry Torokhov @ 2020-02-15 23:30 UTC (permalink / raw)
To: Gustavo A. R. Silva; +Cc: linux-input, linux-kernel
On Fri, Feb 14, 2020 at 11:21:32AM -0600, 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.
>
> [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>
Applied, thank you.
> ---
> drivers/input/mouse/cyapa_gen5.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/input/mouse/cyapa_gen5.c b/drivers/input/mouse/cyapa_gen5.c
> index 14239fbd72cf..7f012bfa2658 100644
> --- a/drivers/input/mouse/cyapa_gen5.c
> +++ b/drivers/input/mouse/cyapa_gen5.c
> @@ -250,7 +250,7 @@ struct cyapa_tsg_bin_image_data_record {
>
> struct cyapa_tsg_bin_image {
> struct cyapa_tsg_bin_image_head image_head;
> - struct cyapa_tsg_bin_image_data_record records[0];
> + struct cyapa_tsg_bin_image_data_record records[];
> } __packed;
>
> struct pip_bl_packet_start {
> @@ -271,7 +271,7 @@ struct pip_bl_cmd_head {
> u8 report_id; /* Bootloader output report id, must be 40h */
> u8 rsvd; /* Reserved, must be 0 */
> struct pip_bl_packet_start packet_start;
> - u8 data[0]; /* Command data variable based on commands */
> + u8 data[]; /* Command data variable based on commands */
> } __packed;
>
> /* Initiate bootload command data structure. */
> @@ -300,7 +300,7 @@ struct tsg_bl_metadata_row_params {
> struct tsg_bl_flash_row_head {
> u8 flash_array_id;
> __le16 flash_row_id;
> - u8 flash_data[0];
> + u8 flash_data[];
> } __packed;
>
> struct pip_app_cmd_head {
> @@ -314,7 +314,7 @@ struct pip_app_cmd_head {
> * Bit 6-0: command code.
> */
> u8 cmd_code;
> - u8 parameter_data[0]; /* Parameter data variable based on cmd_code */
> + u8 parameter_data[]; /* Parameter data variable based on cmd_code */
> } __packed;
>
> /* Application get/set parameter command data structure */
> --
> 2.25.0
>
--
Dmitry
^ permalink raw reply [flat|nested] 2+ messages in thread
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2020-02-14 17:21 [PATCH] Input: cyapa - replace zero-length array with flexible-array member Gustavo A. R. Silva
2020-02-15 23:30 ` Dmitry Torokhov
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