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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-24 19:14:06 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2020-03-12 06:07:56 +0300
commit5febf6d6ae4d488a5dc388c46d96c17f9556238f (patch)
tree220cb44bf3d7792bc6460d43b06e9a90506d1869 /drivers/scsi/mvumi.h
parent5905d4648e7ec2cc9316b17290f21e8bd8a78c32 (diff)
downloadlinux-5febf6d6ae4d488a5dc388c46d96c17f9556238f.tar.xz
scsi: 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/20200224161406.GA21454@embeddedor Reviewed-by: Lee Duncan <lduncan@suse.com> Reviewed-by: Satish Kharat <satishkh@cisco.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/scsi/mvumi.h')
-rw-r--r--drivers/scsi/mvumi.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/mvumi.h b/drivers/scsi/mvumi.h
index ec8cc2207536..60d5691fc4ab 100644
--- a/drivers/scsi/mvumi.h
+++ b/drivers/scsi/mvumi.h
@@ -130,7 +130,7 @@ enum {
struct mvumi_hotplug_event {
u16 size;
u8 dummy[2];
- u8 bitmap[0];
+ u8 bitmap[];
};
struct mvumi_driver_event {
@@ -290,7 +290,7 @@ struct mvumi_rsp_frame {
struct mvumi_ob_data {
struct list_head list;
- unsigned char data[0];
+ unsigned char data[];
};
struct version_info {