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authorDarren Hart <dvhart@linux.intel.com>2012-07-20 11:53:31 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-08-09 08:31:53 -0700
commitb3f9576e98e0dfb4f9be87618da4c5f6e8640ee0 (patch)
treeb405d58aa1c728d27de5b7d08acbe48c756f5d9f /Makefile
parent47b6ff731a701d898c732e2f2dd67c5178fc0960 (diff)
futex: Forbid uaddr == uaddr2 in futex_wait_requeue_pi()
commit 6f7b0a2a5c0fb03be7c25bd1745baa50582348ef upstream. If uaddr == uaddr2, then we have broken the rule of only requeueing from a non-pi futex to a pi futex with this call. If we attempt this, as the trinity test suite manages to do, we miss early wakeups as q.key is equal to key2 (because they are the same uaddr). We will then attempt to dereference the pi_mutex (which would exist had the futex_q been properly requeued to a pi futex) and trigger a NULL pointer dereference. Signed-off-by: Darren Hart <dvhart@linux.intel.com> Cc: Dave Jones <davej@redhat.com> Link: http://lkml.kernel.org/r/ad82bfe7f7d130247fbe2b5b4275654807774227.1342809673.git.dvhart@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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