diff options
author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-02-12 18:55:25 -0600 |
---|---|---|
committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-02-28 12:44:11 +0200 |
commit | b901c2f5b994d45f919ebb01662f96da276f2d3d (patch) | |
tree | b0761773557a329422fb65925026c90fdc6834df /drivers/platform | |
parent | ee633afded0ddaaa44c70f7f87ae1345e8b8e27b (diff) |
platform/x86: i2c-multi-instantiate: 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>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'drivers/platform')
-rw-r--r-- | drivers/platform/x86/i2c-multi-instantiate.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/platform/x86/i2c-multi-instantiate.c b/drivers/platform/x86/i2c-multi-instantiate.c index ffb8d5d1eb5f..6acc8457866e 100644 --- a/drivers/platform/x86/i2c-multi-instantiate.c +++ b/drivers/platform/x86/i2c-multi-instantiate.c @@ -28,7 +28,7 @@ struct i2c_inst_data { struct i2c_multi_inst_data { int num_clients; - struct i2c_client *clients[0]; + struct i2c_client *clients[]; }; static int i2c_multi_inst_count(struct acpi_resource *ares, void *data) |