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mei: bus: 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
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 7649773293 ("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>
This commit is contained in:
Gustavo A. R. Silva 2020-02-11 15:08:22 -06:00 committed by Greg Kroah-Hartman
parent d0cff8adce
commit 6736041f96
1 changed files with 2 additions and 2 deletions
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4
drivers/misc/mei/bus-fixup.c
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@ -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) + \