* Oleg Nesterov <o...@redhat.com> [2012-11-23 21:28:06]:
> register/unregister verifies that inode/uc != NULL. For what?
> This really looks like "hide the potential problem", the caller
> should pass the valid data.
>
> register() also checks uc->next == NULL, probably to prevent the
> double-register but the caller can do other stupid/wrong things.
> If we do this check, then we should document that uc->next should
> be cleared before register() and add BUG_ON().
>
> Also add the small comment about the i_size_read() check.
>
> Signed-off-by: Oleg Nesterov <o...@redhat.com>
We might want to add a warn .. but that shouldnt stop this patch though
Acked-by: Srikar Dronamraju <sri...@linux.vnet.ibm.com>
> ---
> kernel/events/uprobes.c | 7 +------
> 1 files changed, 1 insertions(+), 6 deletions(-)
>
> diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
> index 13b247c..d8e930a 100644
> --- a/kernel/events/uprobes.c
> +++ b/kernel/events/uprobes.c
> @@ -844,9 +844,7 @@ int uprobe_register(struct inode *inode, loff_t offset,
> struct uprobe_consumer *
> struct uprobe *uprobe;
> int ret;
>
> - if (!inode || !uc || uc->next)
> - return -EINVAL;
> -
> + /* Racy, just to catch the obvious mistakes */
> if (offset > i_size_read(inode))
> return -EINVAL;
>
> @@ -883,9 +881,6 @@ void uprobe_unregister(struct inode *inode, loff_t
> offset, struct uprobe_consume
> {
> struct uprobe *uprobe;
>
> - if (!inode || !uc)
> - return;
> -
> uprobe = find_uprobe(inode, offset);
> if (!uprobe)
> return;
> --
> 1.5.5.1
>
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