diff options
| author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-02-11 15:08:22 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-02-11 14:03:19 -0800 |
| commit | 6736041f9606f195339cacb4bcce232f1a2a1ed3 (patch) | |
| tree | 790752293ed46908735f3667a45836c967ec19ce | |
| parent | d0cff8adce1370c03ddb2ccb4d8c2921e00181c4 (diff) | |
mei: bus: 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
inadvertenly introduced[3] to the codebase from now on.
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>
Link: https://lore.kernel.org/r/20200211210822.GA31368@embeddedor
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/misc/mei/bus-fixup.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c index 9ad9c01ddf41..910f059b3384 100644 --- a/drivers/misc/mei/bus-fixup.c +++ b/drivers/misc/mei/bus-fixup.c @@ -91,7 +91,7 @@ struct mkhi_rule_id { struct mkhi_fwcaps { struct mkhi_rule_id id; u8 len; - u8 data[0]; + u8 data[]; } __packed; struct mkhi_fw_ver_block { @@ -119,7 +119,7 @@ struct mkhi_msg_hdr { struct mkhi_msg { struct mkhi_msg_hdr hdr; - u8 data[0]; + u8 data[]; } __packed; #define MKHI_OSVER_BUF_LEN (sizeof(struct mkhi_msg_hdr) + \ |