On 01/10/2013 04:57 PM, Dan Carpenter wrote:
> The closing parenthesis is in the wrong place. We want to check
> "sizeof(*arg->clone_sources) * arg->clone_sources_count" instead of
> "sizeof(*arg->clone_sources * arg->clone_sources_count)".
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> ---
> This is also vulnerable to integer overflows. It's only done under
> root, but these days we are trying to restrict what root can do without
> configuring Secure Boot in UEFI.
>
> diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
> index 5445454..4be3832 100644
> --- a/fs/btrfs/send.c
> +++ b/fs/btrfs/send.c
> @@ -4553,8 +4553,8 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
> }
>
> if (!access_ok(VERIFY_READ, arg->clone_sources,
> - sizeof(*arg->clone_sources *
> - arg->clone_sources_count))) {
> + sizeof(*arg->clone_sources) *
> + arg->clone_sources_count)) {
> ret = -EFAULT;
> goto out;
> }
Reviewed-by: Jie Liu <jeff.liu@xxxxxxxxxx>
Thanks,
-Jeff
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