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authorRoss Zwisler <ross.zwisler@linux.intel.com>2016-01-22 15:10:59 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-01-22 17:02:18 -0800
commiteab95db69d334745d3034072f4a7204084136c88 (patch)
tree3d54065f19a096d64caaf90793ceec9d527060a2 /ipc/util.c
parent5eb88dca9ce4546bdfca6e5defcd50fbe8ea8411 (diff)
downloadlinux-eab95db69d334745d3034072f4a7204084136c88.tar.gz
dax: never rely on bh.b_dev being set by get_block()
Previously in DAX we assumed that calls to get_block() would set bh.b_bdev, and we would then use that value even in error cases for debugging. This caused a NULL pointer dereference in __dax_dbg() which was fixed by a previous commit, but that commit only changed the one place where we were hitting an error. Instead, update dax.c so that we always initialize bh.b_bdev as best we can based on the information that DAX has. get_block() may or may not update to a new value, but this at least lets us get something helpful from bh.b_bdev for error messages and not have to worry about whether it was set by get_block() or not. Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reported-by: Jan Kara <jack@suse.cz> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/util.c')
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