From: Sachin Prabhu <sprabhu@redhat.com>
Date: Mon, 5 Nov 2012 11:39:32 +0000 (+0000)
Subject: cifs: Do not lookup hashed negative dentry in cifs_atomic_open
X-Git-Tag: v3.7-rc5~3^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3798f47aa276b332c30da499cb4df4577e2f8872;p=pandora-kernel.git

cifs: Do not lookup hashed negative dentry in cifs_atomic_open

We do not need to lookup a hashed negative directory since we have
already revalidated it before and have found it to be fine.

This also prevents a crash in cifs_lookup() when it attempts to rehash
the already hashed negative lookup dentry.

The patch has been tested using the reproducer at
https://bugzilla.redhat.com/show_bug.cgi?id=867344#c28

Cc: <stable@kernel.org> # 3.6.x
Reported-by: Vit Zahradka <vit.zahradka@tiscali.cz>
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
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