Petr Vandrovec 53cc0b2948 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>

2008-12-03 12:41:20 +01:00

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