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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-03-20 00:31:08 +0300
committerJiri Kosina <jkosina@suse.cz>2020-03-21 02:07:32 +0300
commit71559219ce36d5861ecc1d31697687c08819b6e5 (patch)
tree4f4e6387109186239f53b7639dcb83f4bcff8f80
parentac309e7744bee222df6de0122facaf2d9706fa70 (diff)
downloadlinux-71559219ce36d5861ecc1d31697687c08819b6e5.tar.xz
HID: intel-ish-hid: ishtp-dev.h: 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: Jiri Kosina <jkosina@suse.cz>
-rw-r--r--drivers/hid/intel-ish-hid/ishtp/ishtp-dev.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hid/intel-ish-hid/ishtp/ishtp-dev.h b/drivers/hid/intel-ish-hid/ishtp/ishtp-dev.h
index 39e0e6c73adf..1cc6364aa957 100644
--- a/drivers/hid/intel-ish-hid/ishtp/ishtp-dev.h
+++ b/drivers/hid/intel-ish-hid/ishtp/ishtp-dev.h
@@ -214,7 +214,7 @@ struct ishtp_device {
const struct ishtp_hw_ops *ops;
size_t mtu;
uint32_t ishtp_msg_hdr;
- char hw[0] __aligned(sizeof(void *));
+ char hw[] __aligned(sizeof(void *));
};
static inline unsigned long ishtp_secs_to_jiffies(unsigned long sec)