diff options
| author |   Al Viro <viro@zeniv.linux.org.uk> | 2017-09-29 13:55:19 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-10-17 01:24:58 -0400 |
| commit | 0db188f96b69957dec623c10b474d12b8b6038c2 (patch) | |
| tree | 8c82b26304d149af4498e694bb38100731c59955 /drivers/mtd | |
| parent | r128: switch compat ioctls to drm_ioctl_kernel() (diff) | |
| download | linux-dev-0db188f96b69957dec623c10b474d12b8b6038c2.tar.xz linux-dev-0db188f96b69957dec623c10b474d12b8b6038c2.zip | |
mtdchar: get rid of pointless access_ok()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/mtdchar.c | 24 |
1 files changed, 1 insertions, 23 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c index 3568294d4854..de8c902059b8 100644 --- a/drivers/mtd/mtdchar.c +++ b/drivers/mtd/mtdchar.c @@ -375,12 +375,7 @@ static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, return -EINVAL; if (!mtd->_write_oob) - ret = -EOPNOTSUPP; - else - ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; - - if (ret) - return ret; + return -EOPNOTSUPP; ops.ooblen = length; ops.ooboffs = start & (mtd->writesize - 1); @@ -419,9 +414,6 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, if (length > 4096) return -EINVAL; - if (!access_ok(VERIFY_WRITE, ptr, length)) - return -EFAULT; - ops.ooblen = length; ops.ooboffs = start & (mtd->writesize - 1); ops.datbuf = NULL; @@ -618,9 +610,6 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd, usr_data = (const void __user *)(uintptr_t)req.usr_data; usr_oob = (const void __user *)(uintptr_t)req.usr_oob; - if (!access_ok(VERIFY_READ, usr_data, req.len) || - !access_ok(VERIFY_READ, usr_oob, req.ooblen)) - return -EFAULT; if (!mtd->_write_oob) return -EOPNOTSUPP; @@ -662,21 +651,10 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) struct mtd_info *mtd = mfi->mtd; void __user *argp = (void __user *)arg; int ret = 0; - u_long size; struct mtd_info_user info; pr_debug("MTD_ioctl\n"); - size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; - if (cmd & IOC_IN) { - if (!access_ok(VERIFY_READ, argp, size)) - return -EFAULT; - } - if (cmd & IOC_OUT) { - if (!access_ok(VERIFY_WRITE, argp, size)) - return -EFAULT; - } - switch (cmd) { case MEMGETREGIONCOUNT: if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) |