From: Jeff Layton <jlayton@primarydata.com>
Date: Fri, 22 Aug 2014 14:18:44 +0000 (-0400)
Subject: locks: close potential race in lease_get_mtime
X-Git-Tag: fixes-against-v3.18-rc2~119^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bfe8602436c803c6d5e271d52cd985d491a7470a;p=pandora-kernel.git

locks: close potential race in lease_get_mtime

lease_get_mtime is called without the i_lock held, so there's no
guarantee about the stability of the list. Between the time when we
assign "flock" and then dereference it to check whether it's a lease
and for write, the lease could be freed.

Ensure that that doesn't occur by taking the i_lock before trying
to check the lease.

Cc: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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