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| author | Tvrtko Ursulin <tvrtko.ursulin@intel.com> | 2016-12-16 13:18:42 +0000 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2016-12-20 16:30:27 +0200 |
| commit | d8953c8326d87a337763ca547ad7db034a94ddb1 (patch) | |
| tree | c992f007daa44dbe82bbeb284f742e150647a131 /drivers/gpu | |
| parent | 1c4672ce4eeaeaadeea8adabaad21262b7172607 (diff) | |
| download | blackbird-obmc-linux-d8953c8326d87a337763ca547ad7db034a94ddb1.tar.gz blackbird-obmc-linux-d8953c8326d87a337763ca547ad7db034a94ddb1.zip | |
drm/i915: Fix use after free in logical_render_ring_init
Commit 3b3f1650b1ca ("drm/i915: Allocate intel_engine_cs
structure only for the enabled engines") introduced the
dynanically allocated engine instances and created an
potential use after free scenario in logical_render_ring_init
where lrc_destroy_wa_ctx_obj could be called after the engine
instance has been freed.
This can only happen during engine setup/init error handling
which luckily does not happen ever in practice.
Fix is to not call lrc_destroy_wa_ctx_obj since it would have
already been executed from the preceding engine cleanup.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 3b3f1650b1ca ("drm/i915: Allocate intel_engine_cs structure only for the enabled engines")
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1481894322-2145-1-git-send-email-tvrtko.ursulin@linux.intel.com
(cherry picked from commit d038fc7e4fff14d6b026130007faef35cbf5e956)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 7 |
1 files changed, 1 insertions, 6 deletions
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 0a09024d6ca3..d4961fa20c73 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -1968,12 +1968,7 @@ int logical_render_ring_init(struct intel_engine_cs *engine) ret); } - ret = logical_ring_init(engine); - if (ret) { - lrc_destroy_wa_ctx_obj(engine); - } - - return ret; + return logical_ring_init(engine); } int logical_xcs_ring_init(struct intel_engine_cs *engine) |
