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platform/chrome: wilco_ec: event: Replace zero-length array with flexible-array member

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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>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Gustavo A. R. Silva 2020-03-20 18:16:34 -05:00 committed by Enric Balletbo i Serra
parent 45620da40f
commit e0db7c42b0
1 changed files with 2 additions and 2 deletions
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4
drivers/platform/chrome/wilco_ec/event.c
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@ -79,7 +79,7 @@ static DEFINE_IDA(event_ida);
struct ec_event {
u16 size;
u16 type;
u16 event[0];
u16 event[];
} __packed;
#define ec_event_num_words(ev) (ev->size - 1)
@ -96,7 +96,7 @@ struct ec_event_queue {
int capacity;
int head;
int tail;
struct ec_event *entries[0];
struct ec_event *entries[];
};
/* Maximum number of events to store in ec_event_queue */