path: root/ipc/util.h
diff options
authorRoss Zwisler <>2016-01-22 15:10:59 -0800
committerLinus Torvalds <>2016-01-22 17:02:18 -0800
commiteab95db69d334745d3034072f4a7204084136c88 (patch)
tree3d54065f19a096d64caaf90793ceec9d527060a2 /ipc/util.h
parent5eb88dca9ce4546bdfca6e5defcd50fbe8ea8411 (diff)
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 <> Reported-by: Jan Kara <> Reviewed-by: Jan Kara <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'ipc/util.h')
0 files changed, 0 insertions, 0 deletions