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authorPetr Vandrovec <petr@vandrovec.name>2008-11-19 05:12:14 -0500
committerJens Axboe <jens.axboe@oracle.com>2008-12-03 06:41:20 -0500
commit53cc0b2948bcb8a084982e6c1f9bd7b337e0df38 (patch)
treee2d4ca231035de3a14f47b97f6c9196fc375340c /arch
parentf6f7b52e2f6149d2ee365717afff315b05720162 (diff)
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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