From: Petr Vandrovec <petr@vandrovec.name>
Date: Wed, 19 Nov 2008 10:12:14 +0000 (+0100)
Subject: When block layer fails to map iov, it calls bio_unmap_user to undo
X-Git-Tag: v2.6.28-rc8~65^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=53cc0b2948bcb8a084982e6c1f9bd7b337e0df38;p=pandora-kernel.git

When block layer fails to map iov, it calls bio_unmap_user to undo
mapping.  Which is good if pages were mapped - but if they were provided
by someone else and just copied then bad things happen - pages are
released once here, and once by caller, leading to user triggerable BUG
at include/linux/mm.h:246.

Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---

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