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drm/i915: Prevent potential null-ptr-deref in engine_init_common

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If measure_breadcrumb_dw() returns an error and bce isn't created,
this commit ensures that intel_engine_destroy_pinned_context()
is not called with a NULL bce.

v2: Fix the subject s/UAF/null-ptr-deref(Jani)

Fixes: b352749936 ("drm/i915: Create a kernel context for GGTT updates")
Cc: Oak Zeng <oak.zeng@intel.com>
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231011122547.7085-1-nirmoy.das@intel.com
This commit is contained in:
Nirmoy Das 2023-10-11 14:25:47 +02:00
parent 2d6e2b10a7
commit f1cdb599ce
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/gt/intel_engine_cs.c
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@ -1491,7 +1491,8 @@ static int engine_init_common(struct intel_engine_cs *engine)
return 0;
err_bce_context:
intel_engine_destroy_pinned_context(bce);
if (bce)
intel_engine_destroy_pinned_context(bce);
err_ce_context:
intel_engine_destroy_pinned_context(ce);
return ret;