Commit 5657cb07 authored by Jens Axboe's avatar Jens Axboe

fs/fcntl: use copy_to/from_user() for u64 types

Some architectures (at least PPC) doesn't like get/put_user with
64-bit types on a 32-bit system. Use the variably sized copy
to/from user variants instead.
Reported-by: 's avatarStephen Rothwell <sfr@canb.auug.org.au>
Fixes: c75b1d94 ("fs: add fcntl() interface for setting/getting write life time hints")
Signed-off-by: 's avatarJens Axboe <axboe@kernel.dk>
parent e9d5d4a0
......@@ -264,15 +264,18 @@ static long fcntl_rw_hint(struct file *file, unsigned int cmd,
struct inode *inode = file_inode(file);
u64 *argp = (u64 __user *)arg;
enum rw_hint hint;
u64 h;
switch (cmd) {
case F_GET_FILE_RW_HINT:
if (put_user(file_write_hint(file), argp))
h = file_write_hint(file);
if (copy_to_user(argp, &h, sizeof(*argp)))
return -EFAULT;
return 0;
case F_SET_FILE_RW_HINT:
if (get_user(hint, argp))
if (copy_from_user(&h, argp, sizeof(h)))
return -EFAULT;
hint = (enum rw_hint) h;
if (!rw_hint_valid(hint))
return -EINVAL;
......@@ -281,12 +284,14 @@ static long fcntl_rw_hint(struct file *file, unsigned int cmd,
spin_unlock(&file->f_lock);
return 0;
case F_GET_RW_HINT:
if (put_user(inode->i_write_hint, argp))
h = inode->i_write_hint;
if (copy_to_user(argp, &h, sizeof(*argp)))
return -EFAULT;
return 0;
case F_SET_RW_HINT:
if (get_user(hint, argp))
if (copy_from_user(&h, argp, sizeof(h)))
return -EFAULT;
hint = (enum rw_hint) h;
if (!rw_hint_valid(hint))
return -EINVAL;
......
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