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misc: xilinx-sdfec: remove check for ioctl cmd and argument. 

if (_IOC_TYPE(cmd) != PP_IOCTL)
        return -ENOTTY;

Invalid ioctl command check normally performs by “default” case.

if (_IOC_DIR(cmd) != _IOC_NONE) {
       argp = (void __user *)arg;
       if (!argp)
             return -EINVAL; }

And for checking ioctl arguments, copy_from_user()/copy_to_user()
checks are enough.

Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Harshal Chaudhari <harshalchau04@gmail.com>
Link: https://lore.kernel.org/r/20201101170949.18616-1-harshalchau04@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Harshal Chaudhari 2020-11-01 22:39:49 +05:30 committed by Greg Kroah-Hartman
parent 33fcc54918
commit c78c95f919
1 changed files with 3 additions and 13 deletions
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16
drivers/misc/xilinx_sdfec.c
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@ -944,8 +944,8 @@ static long xsdfec_dev_ioctl(struct file *fptr, unsigned int cmd,
unsigned long data) unsigned long data)
{ {
struct xsdfec_dev *xsdfec; struct xsdfec_dev *xsdfec;
void __user *arg = NULL; void __user *arg = (void __user *)data;
int rval = -EINVAL; int rval;
xsdfec = container_of(fptr->private_data, struct xsdfec_dev, miscdev); xsdfec = container_of(fptr->private_data, struct xsdfec_dev, miscdev);
@ -956,16 +956,6 @@ static long xsdfec_dev_ioctl(struct file *fptr, unsigned int cmd,
return -EPERM; return -EPERM;
} }
if (_IOC_TYPE(cmd) != XSDFEC_MAGIC)
return -ENOTTY;
/* check if ioctl argument is present and valid */
if (_IOC_DIR(cmd) != _IOC_NONE) {
arg = (void __user *)data;
if (!arg)
return rval;
}
switch (cmd) { switch (cmd) {
case XSDFEC_START_DEV: case XSDFEC_START_DEV:
rval = xsdfec_start(xsdfec); rval = xsdfec_start(xsdfec);
@ -1010,7 +1000,7 @@ static long xsdfec_dev_ioctl(struct file *fptr, unsigned int cmd,
rval = xsdfec_is_active(xsdfec, (bool __user *)arg); rval = xsdfec_is_active(xsdfec, (bool __user *)arg);
break; break;
default: default:
/* Should not get here */ rval = -ENOTTY;
break; break;
} }
return rval; return rval;