From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 30 May 2020 00:40:27 +0100
Subject: scsi: hpsa: Get rid of compat_alloc_user_space()
Patch-mainline: v5.8-rc1
Git-commit: 10100ffd5f6584298b72f9fe26f32cf02abfb8b0
References: jsc#SLE-15150
No need for building a native struct on kernel stack, copying it to
userland one, then calling hpsa_ioctl() which copies it back into _another_
instance of the same struct.
Link: https://lore.kernel.org/r/20200529234028.46373-3-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 | 80 +++++++++++++++++++++++-----------------------------
1 file changed, 36 insertions(+), 44 deletions(-)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -255,6 +255,10 @@ static irqreturn_t do_hpsa_intr_intx(int
static irqreturn_t do_hpsa_intr_msi(int irq, void *dev_id);
static int hpsa_ioctl(struct scsi_device *dev, unsigned int cmd,
void __user *arg);
+static int hpsa_passthru_ioctl(struct ctlr_info *h,
+ IOCTL_Command_struct *iocommand);
+static int hpsa_big_passthru_ioctl(struct ctlr_info *h,
+ BIG_IOCTL_Command_struct *ioc);
#ifdef CONFIG_COMPAT
static int hpsa_compat_ioctl(struct scsi_device *dev, unsigned int cmd,
@@ -6218,75 +6222,63 @@ static void cmd_free(struct ctlr_info *h
static int hpsa_ioctl32_passthru(struct scsi_device *dev, unsigned int cmd,
void __user *arg)
{
- IOCTL32_Command_struct __user *arg32 =
- (IOCTL32_Command_struct __user *) arg;
+ struct ctlr_info *h = sdev_to_hba(dev);
+ IOCTL32_Command_struct __user *arg32 = arg;
IOCTL_Command_struct arg64;
- IOCTL_Command_struct __user *p = compat_alloc_user_space(sizeof(arg64));
int err;
u32 cp;
- memset(&arg64, 0, sizeof(arg64));
- err = 0;
- err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
- sizeof(arg64.LUN_info));
- err |= copy_from_user(&arg64.Request, &arg32->Request,
- sizeof(arg64.Request));
- err |= copy_from_user(&arg64.error_info, &arg32->error_info,
- sizeof(arg64.error_info));
- err |= get_user(arg64.buf_size, &arg32->buf_size);
- err |= get_user(cp, &arg32->buf);
- arg64.buf = compat_ptr(cp);
- err |= copy_to_user(p, &arg64, sizeof(arg64));
+ if (!arg)
+ return -EINVAL;
- if (err)
+ memset(&arg64, 0, sizeof(arg64));
+ if (copy_from_user(&arg64, arg32, offsetof(IOCTL_Command_struct, buf)))
return -EFAULT;
+ if (get_user(cp, &arg32->buf))
+ return -EFAULT;
+ arg64.buf = compat_ptr(cp);
- err = hpsa_ioctl(dev, CCISS_PASSTHRU, p);
+ if (atomic_dec_if_positive(&h->passthru_cmds_avail) < 0)
+ return -EAGAIN;
+ err = hpsa_passthru_ioctl(h, &arg64);
+ atomic_inc(&h->passthru_cmds_avail);
if (err)
return err;
- err |= copy_in_user(&arg32->error_info, &p->error_info,
- sizeof(arg32->error_info));
- if (err)
+ if (copy_to_user(&arg32->error_info, &arg64.error_info,
+ sizeof(arg32->error_info)))
return -EFAULT;
- return err;
+ return 0;
}
static int hpsa_ioctl32_big_passthru(struct scsi_device *dev,
unsigned int cmd, void __user *arg)
{
- BIG_IOCTL32_Command_struct __user *arg32 =
- (BIG_IOCTL32_Command_struct __user *) arg;
+ struct ctlr_info *h = sdev_to_hba(dev);
+ BIG_IOCTL32_Command_struct __user *arg32 = arg;
BIG_IOCTL_Command_struct arg64;
- BIG_IOCTL_Command_struct __user *p =
- compat_alloc_user_space(sizeof(arg64));
int err;
u32 cp;
+ if (!arg)
+ return -EINVAL;
memset(&arg64, 0, sizeof(arg64));
- err = 0;
- err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
- sizeof(arg64.LUN_info));
- err |= copy_from_user(&arg64.Request, &arg32->Request,
- sizeof(arg64.Request));
- err |= copy_from_user(&arg64.error_info, &arg32->error_info,
- sizeof(arg64.error_info));
- err |= get_user(arg64.buf_size, &arg32->buf_size);
- err |= get_user(arg64.malloc_size, &arg32->malloc_size);
- err |= get_user(cp, &arg32->buf);
- arg64.buf = compat_ptr(cp);
- err |= copy_to_user(p, &arg64, sizeof(arg64));
-
- if (err)
+ if (copy_from_user(&arg64, arg32,
+ offsetof(BIG_IOCTL32_Command_struct, buf)))
return -EFAULT;
+ if (get_user(cp, &arg32->buf))
+ return -EFAULT;
+ arg64.buf = compat_ptr(cp);
- err = hpsa_ioctl(dev, CCISS_BIG_PASSTHRU, p);
+ if (atomic_dec_if_positive(&h->passthru_cmds_avail) < 0)
+ return -EAGAIN;
+ err = hpsa_big_passthru_ioctl(h, &arg64);
+ atomic_inc(&h->passthru_cmds_avail);
if (err)
return err;
- err |= copy_in_user(&arg32->error_info, &p->error_info,
- sizeof(arg32->error_info));
- if (err)
+ if (copy_to_user(&arg32->error_info, &arg64.error_info,
+ sizeof(arg32->error_info)))
return -EFAULT;
- return err;
+ return 0;
}
static int hpsa_compat_ioctl(struct scsi_device *dev, unsigned int cmd,