lkml.org 
[lkml]   [2012]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 3/7] uprobes: Kill the pointless inode/uc checks in register/unregister
* Oleg Nesterov <oleg@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 <oleg@redhat.com>

We might want to add a warn .. but that shouldnt stop this patch though

Acked-by: Srikar Dronamraju <srikar@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
>



\
 
 \ /
  Last update: 2012-12-13 16:01    [W:0.144 / U:0.164 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site