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Oleg Nesterov authored
When send_cpu_listeners() finds the orphaned listener it marks it as !valid and drops listeners->sem. Before it takes this sem for writing, s->pid can be reused and add_del_listener() can wrongly try to re-use this entry. Change add_del_listener() to check ->valid = T. Signed-off-by:
Oleg Nesterov <oleg@redhat.com> Reviewed-by:
Vasiliy Kulikov <segoon@openwall.com> Acked-by:
Balbir Singh <bsingharora@gmail.com> Cc: Jerome Marchand <jmarchan@redhat.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
a7295898