From fd6282af8ebd92a32d0b877efb28a3f3272fbed0 Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Thu, 19 Mar 2020 17:25:33 -0500 Subject: [PATCH] scsi: message: fusion: 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") Link: https://lore.kernel.org/r/20200319222533.GA20577@embeddedor.com Signed-off-by: Gustavo A. R. Silva Signed-off-by: Martin K. Petersen --- drivers/message/fusion/mptsas.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/message/fusion/mptsas.h b/drivers/message/fusion/mptsas.h index c396483d3624..e35b13891fe4 100644 --- a/drivers/message/fusion/mptsas.h +++ b/drivers/message/fusion/mptsas.h @@ -110,7 +110,7 @@ struct fw_event_work { MPT_ADAPTER *ioc; u32 event; u8 retries; - char event_data[0] __aligned(4); + char event_data[] __aligned(4); }; struct mptsas_discovery_event {