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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-03-21 02:15:42 +0300
committerEnric Balletbo i Serra <enric.balletbo@collabora.com>2020-03-22 13:15:18 +0300
commit45620da40f6fe627f6f98ba4f6edc2e43dd8d291 (patch)
tree5af9a156fd32012df0ff14df8f519bee32c01b33 /drivers/platform
parentad7c0510c99ef1568fcfd0ac7e2cefca3b30477a (diff)
downloadlinux-45620da40f6fe627f6f98ba4f6edc2e43dd8d291.tar.xz
platform/chrome: cros_ec_chardev: 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 76497732932f ("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>
Diffstat (limited to 'drivers/platform')
-rw-r--r--drivers/platform/chrome/cros_ec_chardev.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/platform/chrome/cros_ec_chardev.c b/drivers/platform/chrome/cros_ec_chardev.c
index b51ab24055f3..e0bce869c49a 100644
--- a/drivers/platform/chrome/cros_ec_chardev.c
+++ b/drivers/platform/chrome/cros_ec_chardev.c
@@ -48,7 +48,7 @@ struct ec_event {
struct list_head node;
size_t size;
u8 event_type;
- u8 data[0];
+ u8 data[];
};
static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen)