From 8acd7c56c1b502b745c7b0dc341abcd1415ba5ad Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Tue, 11 Feb 2020 15:12:19 -0600 Subject: [PATCH] staging: greybus: 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 Link: https://lore.kernel.org/r/20200211211219.GA673@embeddedor Signed-off-by: Greg Kroah-Hartman --- drivers/staging/greybus/raw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/greybus/raw.c b/drivers/staging/greybus/raw.c index 64a17dfe3b6e..2a375f407d38 100644 --- a/drivers/staging/greybus/raw.c +++ b/drivers/staging/greybus/raw.c @@ -29,7 +29,7 @@ struct gb_raw { struct raw_data { struct list_head entry; u32 len; - u8 data[0]; + u8 data[]; }; static struct class *raw_class; -- 2.11.0