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Input: cyapa - 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 7649773293 ("cxgb3/l2t: Fix undefined behaviour")

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Link: https://lore.kernel.org/r/20200214172132.GA28389@embeddedor
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Gustavo A. R. Silva 2020-02-14 17:03:12 -08:00 committed by Dmitry Torokhov
parent 94bef5d579
commit 3dbae15538
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/input/mouse/cyapa_gen5.c
View File

@ -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 */