tree e2d4ca231035de3a14f47b97f6c9196fc375340c
parent f6f7b52e2f6149d2ee365717afff315b05720162
author Petr Vandrovec <petr@vandrovec.name> 1227089534 +0100
committer Jens Axboe <jens.axboe@oracle.com> 1228304480 +0100

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>