From 5a53881580f90a5e4404954af16a5646ee9d7842 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Thu, 19 Mar 2020 16:21:53 -0500 Subject: [PATCH] fpga: dfl.h: 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 Signed-off-by: Moritz Fischer --- drivers/fpga/dfl.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h index 4a9a33cd9979..74784d3cfe7c 100644 --- a/drivers/fpga/dfl.h +++ b/drivers/fpga/dfl.h @@ -235,7 +235,7 @@ struct dfl_feature_platform_data { int open_count; void *private; int num; - struct dfl_feature features[0]; + struct dfl_feature features[]; }; static inline