drm/i915/gem: Safely acquire the ctx->vm when copying

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As we read the ctx->vm unlocked before cloning/exporting, we should
validate our reference is correct before returning it. We already do for
clone_vm() but were not so strict around get_ppgtt().

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191106091312.12921-1-chris@chris-wilson.co.uk

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Chris Wilson 2019-11-06 09:13:12 +00:00

parent 7caaed94ea

commit 27dbae8f36

1 changed files with 49 additions and 37 deletions

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drivers/gpu/drm/i915/gem/i915_gem_context.c

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