[Unionfs] NULL pointer dereference if copyup_dentry() failed?

[Tetsuo Handa]

Hello.

Erez Zadok wrote:
> Thanks, Tetsuo.  I was able to reproduce the bug even w/ your old procedure,
> and I understand now how it happens; the hint is some debugging info that
> unionfs prints up as "CI" (Check Inode) shortly before the oops.
> 
> The patch below fixes this bug.  I tried it on top of unionfs-2.5 + 2.6.24.7
> + your patches as per your original email.  With this patch I get this
> behaviour from /bin/touch (I assume that's what supposed to happen, right?):
>
> # /bin/touch /mnt/foo
> /bin/touch: setting times of `/mnt/foo': Operation not permitted
Right.

> Please try this patch and let me know.
It solved the problem for both CentOS 5.2 and Debian Sarge.

Thank you very much.