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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-03-19 17:25:33 -0500
committerMartin K. Petersen <martin.petersen@oracle.com>2020-03-26 22:40:47 -0400
commitfd6282af8ebd92a32d0b877efb28a3f3272fbed0 (patch)
treeac995316cd4257d140c520ad75ca5f5d5391eea4 /drivers/message/fusion
parent4f93c4bf0f748f9d0f5e9764ba69ec16c368922a (diff)
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 <gustavo@embeddedor.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/message/fusion')
-rw-r--r--drivers/message/fusion/mptsas.h2
1 files changed, 1 insertions, 1 deletions
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 {