Commit 681c896c authored by Gustavo A. R. Silva's avatar Gustavo A. R. Silva Committed by Mark Brown

ASoC: wm0010: 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 76497732 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: default avatarGustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: default avatarCharles Keepax <ckeepax@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20200211200549.GA12072@embeddedorSigned-off-by: default avatarMark Brown <broonie@kernel.org>
parent 82dabf59
...@@ -43,7 +43,7 @@ struct dfw_binrec { ...@@ -43,7 +43,7 @@ struct dfw_binrec {
u8 command; u8 command;
u32 length:24; u32 length:24;
u32 address; u32 address;
uint8_t data[0]; uint8_t data[];
} __packed; } __packed;
struct dfw_inforec { struct dfw_inforec {
......
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