From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 30 May 2020 00:40:26 +0100
Subject: scsi: hpsa: Don't bother with vmalloc for BIG_IOCTL_Command_struct
Patch-mainline: v5.8-rc1
Git-commit: cb17c1b69b175e3f7ae2ef53e384889cdbae5c0d
References: jsc#SLE-15150
"BIG" in the name refers to the amount of data being transferred, _not_ the
size of structure itself; it's 140 or 144 bytes (for 32bit and 64bit hosts
resp.). IOCTL_Command_struct is 136 or 144 bytes large...
No point whatsoever turning that into dynamic allocation, let alone vmalloc
one. Just keep it as local variable...
Link: https://lore.kernel.org/r/20200529234028.46373-2-viro@ZenIV.linux.org.uk
Acked-by: Don Brace <don.brace@microsemi.com>
Tested-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Martin Wilck <mwilck@suse.com>
---
drivers/scsi/hpsa.c | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -6620,21 +6620,17 @@ static int hpsa_ioctl(struct scsi_device
return rc;
}
case CCISS_BIG_PASSTHRU: {
- BIG_IOCTL_Command_struct *ioc;
+ BIG_IOCTL_Command_struct ioc;
if (!argp)
return -EINVAL;
+ if (copy_from_user(&ioc, argp, sizeof(ioc)))
+ return -EFAULT;
if (atomic_dec_if_positive(&h->passthru_cmds_avail) < 0)
return -EAGAIN;
- ioc = vmemdup_user(argp, sizeof(*ioc));
- if (IS_ERR(ioc)) {
- atomic_inc(&h->passthru_cmds_avail);
- return PTR_ERR(ioc);
- }
- rc = hpsa_big_passthru_ioctl(h, ioc);
+ rc = hpsa_big_passthru_ioctl(h, &ioc);
atomic_inc(&h->passthru_cmds_avail);
- if (!rc && copy_to_user(argp, ioc, sizeof(*ioc)))
+ if (!rc && copy_to_user(argp, &ioc, sizeof(ioc)))
rc = -EFAULT;
- kvfree(ioc);
return rc;
}
default: