On 10/28/2010 04:39 AM, Vasiliy Kulikov wrote:
> put_user() may fail. In this case propagate error code from
> privcmd_ioctl_mmap_batch().
Thanks for looking at this. I'm in two minds about this; the existing
logic is such that these put_users can only fail if something else has
already failed and its returning an error. I guess it would be useful
to get an EFAULT if you've got a problem writing back the results.
IanC, any opinion?
Thanks,
J
> Signed-off-by: Vasiliy Kulikov <segooon@xxxxxxxxx>
> ---
> Compile tested.
>
> drivers/xen/xenfs/privcmd.c | 8 ++------
> 1 files changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/xen/xenfs/privcmd.c b/drivers/xen/xenfs/privcmd.c
> index f80be7f..2eb04c8 100644
> --- a/drivers/xen/xenfs/privcmd.c
> +++ b/drivers/xen/xenfs/privcmd.c
> @@ -266,9 +266,7 @@ static int mmap_return_errors(void *data, void *state)
> xen_pfn_t *mfnp = data;
> struct mmap_batch_state *st = state;
>
> - put_user(*mfnp, st->user++);
> -
> - return 0;
> + return put_user(*mfnp, st->user++);
> }
>
> static struct vm_operations_struct privcmd_vm_ops;
> @@ -323,10 +321,8 @@ static long privcmd_ioctl_mmap_batch(void __user *udata)
> up_write(&mm->mmap_sem);
>
> if (state.err > 0) {
> - ret = 0;
> -
> state.user = m.arr;
> - traverse_pages(m.num, sizeof(xen_pfn_t),
> + ret = traverse_pages(m.num, sizeof(xen_pfn_t),
> &pagelist,
> mmap_return_errors, &state);
> }
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