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 <ccross@android.com> Cc: Arve Hjønnevåg <arve@android.com> Cc: Dmitry Shmidt <dimitrysh@google.com> Cc: Rom Lemarchand <romlem@google.com> Cc: Serban Constantinescu <serban.constantinescu@arm.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Android Kernel Team <kernel-team@android.com> Signed-off-by: NDmitry Shmidt <dimitrysh@google.com> [jstultz: Minor commit message tweaks] Signed-off-by: NJohn Stultz <john.stultz@linaro.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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