Re: [PATCH] fs/9p: Initialize status in v9fs_file_do_lock.

[Dominique Martinet]

Kirill A. Shutemov wrote on Fri, Jan 09, 2015 at 02:33:53PM +0200:
> On Fri, Jan 09, 2015 at 12:56:07PM +0100, Dominique Martinet wrote:
> > If p9_client_lock_dotl returns an error, status is possibly never filled
> > but will be used in the following switch.
> > Initializing it to P9_LOCK_ERROR makes sur we will return an error and
> > cleanup (and not hit the default case).
> 
> That's what my patch[1] fixes.
> 
> http://marc.info/?i=1419858019-116944-1-git-send-email-kirill.shutemov%40linux.intel.com

Actually, it's slightly different and still worth adding (mine if we
apply your's first and your's if we apply mine first - don't think
they'll conflict. I even reworded the (too old!) commit message to fit
with your patch :))

Your patch will not BUG() if status is junk, BUT if status uninitialized
value is 0 and p9_client_lock_dotl then we'll return res=0 (success) and
not unlock before returning. My patch makes sure we'll return -ENOLCK.

Likewise, if we only apply my patch then a rogue server could BUG() a
client, so we want your's anyway.

-- 
Dominique Martinet,
CEA

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