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firmware: arm_scpi: 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")

Replace the zero-length member "payload" in {legacy_,}scpi_shared_mem
structures with flexible-array.

Link: https://lore.kernel.org/r/20200211231604.GA17274@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Gustavo A. R. Silva 2020-02-11 17:16:04 -06:00 committed by Sudeep Holla
parent 8694548ae1
commit 539db76293
1 changed files with 2 additions and 2 deletions
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4
drivers/firmware/arm_scpi.c
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@ -262,12 +262,12 @@ struct scpi_drvinfo {
struct scpi_shared_mem {
__le32 command;
__le32 status;
u8 payload[0];
u8 payload[];
} __packed;
struct legacy_scpi_shared_mem {
__le32 status;
u8 payload[0];
u8 payload[];
} __packed;
struct scp_capabilities {