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authorLinus Torvalds <torvalds@linux-foundation.org>2017-07-08 20:15:02 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-08 20:15:02 +0300
commit46ace66b3b34c80341c6290cd608aae4d2de9879 (patch)
tree81690f3d0e3e73e898ac38f6689f8e8f798b3697 /fs/compat_ioctl.c
parentcee37d83e6d9ada1c2254c73bac7955f9e048d22 (diff)
parent119d0312c766773ca3238b9d926077664eed22be (diff)
downloadlinux-46ace66b3b34c80341c6290cd608aae4d2de9879.tar.xz
Merge branch 'work.__copy_in_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull __copy_in_user removal from Al Viro: "There used to be 6 places in the entire tree calling __copy_in_user(), all of them bogus. Four got killed off in work.drm branch, this takes care of the remaining ones and kills the definition of that sucker" * 'work.__copy_in_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: kill __copy_in_user() sanitize do_i2c_smbus_ioctl()
Diffstat (limited to 'fs/compat_ioctl.c')
-rw-r--r--fs/compat_ioctl.c19
1 files changed, 9 insertions, 10 deletions
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 112b3e1e20e3..2dd4a7af7dd7 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -739,23 +739,22 @@ static int do_i2c_smbus_ioctl(struct file *file,
unsigned int cmd, struct i2c_smbus_ioctl_data32 __user *udata)
{
struct i2c_smbus_ioctl_data __user *tdata;
- compat_caddr_t datap;
+ union {
+ /* beginnings of those have identical layouts */
+ struct i2c_smbus_ioctl_data32 data32;
+ struct i2c_smbus_ioctl_data data;
+ } v;
tdata = compat_alloc_user_space(sizeof(*tdata));
if (tdata == NULL)
return -ENOMEM;
- if (!access_ok(VERIFY_WRITE, tdata, sizeof(*tdata)))
- return -EFAULT;
- if (!access_ok(VERIFY_READ, udata, sizeof(*udata)))
+ memset(&v, 0, sizeof(v));
+ if (copy_from_user(&v.data32, udata, sizeof(v.data32)))
return -EFAULT;
+ v.data.data = compat_ptr(v.data32.data);
- if (__copy_in_user(&tdata->read_write, &udata->read_write, 2 * sizeof(u8)))
- return -EFAULT;
- if (__copy_in_user(&tdata->size, &udata->size, 2 * sizeof(u32)))
- return -EFAULT;
- if (__get_user(datap, &udata->data) ||
- __put_user(compat_ptr(datap), &tdata->data))
+ if (copy_to_user(tdata, &v.data, sizeof(v.data)))
return -EFAULT;
return do_ioctl(file, cmd, (unsigned long)tdata);