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Staging: comedi: Return -EFAULT if copy_to_user() fails

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Return -EFAULT on error instead of the number of bytes remaining to be
copied.

Fixes: bac42fb21259 ("comedi: get rid of compat_alloc_user_space() mess in COMEDI_CMD{,TEST} compat")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/X8c3pfwFy2jpy4BP@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2020-12-02 09:43:49 +03:00 committed by Greg Kroah-Hartman
parent 12b38ea040
commit cab36da4bf
1 changed files with 3 additions and 1 deletions
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4
drivers/staging/comedi/comedi_fops.c
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@ -2987,7 +2987,9 @@ static int put_compat_cmd(struct comedi32_cmd_struct __user *cmd32,
v32.chanlist_len = cmd->chanlist_len;
v32.data = ptr_to_compat(cmd->data);
v32.data_len = cmd->data_len;
return copy_to_user(cmd32, &v32, sizeof(v32));
if (copy_to_user(cmd32, &v32, sizeof(v32)))
return -EFAULT;
return 0;
}
/* Handle 32-bit COMEDI_CMD ioctl. */