From cb17c1b69b175e3f7ae2ef53e384889cdbae5c0d Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 30 May 2020 00:40:26 +0100 Subject: [PATCH] scsi: hpsa: Don't bother with vmalloc for BIG_IOCTL_Command_struct "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 Tested-by: Don Brace Signed-off-by: Al Viro Signed-off-by: Martin K. Petersen --- drivers/scsi/hpsa.c | 14 +++++--------- 1 file changed, 5 insertions(+), 9 deletions(-) diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c index 3344a06..64fd972 100644 --- a/drivers/scsi/hpsa.c +++ b/drivers/scsi/hpsa.c @@ -6619,21 +6619,17 @@ static int hpsa_ioctl(struct scsi_device *dev, unsigned int cmd, 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: -- 2.7.4