On Thu, Jan 10, 2013 at 11:57:25AM +0300, 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>
Original message id: <20130110085725.GA23063@elgon.mountain>
This patch hasn't been applied.
> ---
> 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.
Although it's a security fix, it's not exploitable by a user so it's not
that urgent to get it merged. Nevertheless, I hope you can squeeze it
into 3.12-rc so we can then start pushing it to stable kernels (at least
3.10).
> 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;
> }
david
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