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authorGustavo A. R. Silva <gustavo@embeddedor.com>2020-02-24 10:14:06 -0600
committerMartin K. Petersen <martin.petersen@oracle.com>2020-03-11 23:07:56 -0400
commit5febf6d6ae4d488a5dc388c46d96c17f9556238f (patch)
tree220cb44bf3d7792bc6460d43b06e9a90506d1869 /drivers/scsi/isci
parent5905d4648e7ec2cc9316b17290f21e8bd8a78c32 (diff)
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/isci')
-rw-r--r--drivers/scsi/isci/sas.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/isci/sas.h b/drivers/scsi/isci/sas.h
index dc26b4aea99e..15d8f3631ab7 100644
--- a/drivers/scsi/isci/sas.h
+++ b/drivers/scsi/isci/sas.h
@@ -201,7 +201,7 @@ struct smp_req {
u8 func; /* byte 1 */
u8 alloc_resp_len; /* byte 2 */
u8 req_len; /* byte 3 */
- u8 req_data[0];
+ u8 req_data[];
} __packed;
/*