[ { "PublicDescription": "Unhalted core cycles when the thread is in ring 0.", "EventCode": "0x5C", "Counter": "0,1,2,3", "UMask": "0x1", "EventName": "CPL_CYCLES.RING0", "SampleAfterValue": "2000003", "BriefDescription": "Unhalted core cycles when the thread is in ring 0", "CounterHTOff": "0,1,2,3,4,5,6,7" }, { "PublicDescription": "Unhalted core cycles when the thread is not in ring 0.", "EventCode": "0x5C", "Counter": "0,1,2,3", "UMask": "0x2", "EventName": "CPL_CYCLES.RING123", "SampleAfterValue": "2000003", "BriefDescription": "Unhalted core cycles when thread is in rings 1, 2, or 3", "CounterHTOff": "0,1,2,3,4,5,6,7" }, { "EventCode": "0x5C", "Counter": "0,1,2,3", "UMask": "0x1", "EdgeDetect": "1", "EventName": "CPL_CYCLES.RING0_TRANS", "SampleAfterValue": "100003", "BriefDescription": "Number of intervals between processor halts while thread is in ring 0.", "CounterMask": "1", "CounterHTOff": "0,1,2,3,4,5,6,7" }, { "PublicDescription": "Cycles in which the L1D and L2 are locked, due to a UC lock or split lock.", "EventCode": "0x63", "Counter": "0,1,2,3", "UMask": "0x1", "EventName": "LOCK_CYCLES.SPLIT_LOCK_UC_LOCK_DURATION", "SampleAfterValue": "2000003", "BriefDescription": "Cycles when L1 and L2 are locked due to UC or split lock", "CounterHTOff": "0,1,2,3,4,5,6,7" } ]1db9f6e71b24440b5f1d93e968ee3'>refslogtreecommitdiff
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drm/i915: fix use-after-free in page_flip_completed()
page_flip_completed() dereferences 'work' variable after executing queue_work(). This is not safe as the 'work' item might be already freed by queued work: BUG: KASAN: use-after-free in page_flip_completed+0x3ff/0x490 at addr ffff8803dc010f90 Call Trace: __asan_report_load8_noabort+0x59/0x80 page_flip_completed+0x3ff/0x490 intel_finish_page_flip_mmio+0xe3/0x130 intel_pipe_handle_vblank+0x2d/0x40 gen8_irq_handler+0x4a7/0xed0 __handle_irq_event_percpu+0xf6/0x860 handle_irq_event_percpu+0x6b/0x160 handle_irq_event+0xc7/0x1b0 handle_edge_irq+0x1f4/0xa50 handle_irq+0x41/0x70 do_IRQ+0x9a/0x200 common_interrupt+0x89/0x89 Freed: kfree+0x113/0x4d0 intel_unpin_work_fn+0x29a/0x3b0 process_one_work+0x79e/0x1b70 worker_thread+0x611/0x1460 kthread+0x241/0x3a0 ret_from_fork+0x27/0x40 Move queue_work() after trace_i915_flip_complete() to fix this. Fixes: e5510fac98a7 ("drm/i915: add tracepoints for flip requests & completions") Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: <stable@vger.kernel.org> # v2.6.36+ Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20170126143211.24013-1-aryabinin@virtuozzo.com (cherry picked from commit 05c41f926fcc7ef838c80a6a99d84f67b4e0b824) Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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