android: drivers: Avoid debugfs race in binder

If a /d/binder/proc/[pid] entry is kept open after linux has
torn down the associated process, binder_proc_show can deference
an invalid binder_proc that has been stashed in the debugfs
inode.  Validate that the binder_proc ptr passed into binder_proc_show
has not been freed by looking for it within the global process list
whilst the global lock is held. If the ptr is not valid, print nothing.

Cc: Colin Cross <[email protected]>
Cc: Arve Hjønnevåg <[email protected]>
Cc: Dmitry Shmidt <[email protected]>
Cc: Rom Lemarchand <[email protected]>
Cc: Serban Constantinescu <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Android Kernel Team <[email protected]>
Signed-off-by: Dmitry Shmidt <[email protected]>
[jstultz: Minor commit message tweaks]
Signed-off-by: John Stultz <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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