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drm/i915/gt: Prevent error pointer dereference

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Move the check for "if (IS_ERR(obj))" in front of the call to
i915_gem_object_set_cache_coherency() which dereferences "obj".
Otherwise it will lead to a crash.

Fixes: 43aa755eae ("drm/i915/mtl: Update cache coherency setting for context structure")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/455b2279-2e08-4d00-9784-be56d8ee42e3@moroto.mountain
(cherry picked from commit c92ec50822)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Dan Carpenter 2023-09-13 11:17:41 +03:00 • committed by Rodrigo Vivi
parent ce9ecca023
commit f17cc0f11f
1 changed files with 3 additions and 2 deletions
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5
drivers/gpu/drm/i915/gt/intel_lrc.c
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@ -1094,6 +1094,9 @@ __lrc_alloc_state(struct intel_context *ce, struct intel_engine_cs *engine)
I915_BO_ALLOC_PM_VOLATILE);
if (IS_ERR(obj)) {
obj = i915_gem_object_create_shmem(engine->i915, context_size);
if (IS_ERR(obj))
return ERR_CAST(obj);
/*
* Wa_22016122933: For Media version 13.0, all Media GT shared
* memory needs to be mapped as WC on CPU side and UC (PAT
@ -1102,8 +1105,6 @@ __lrc_alloc_state(struct intel_context *ce, struct intel_engine_cs *engine)
if (intel_gt_needs_wa_22016122933(engine->gt))
i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
}
if (IS_ERR(obj))
return ERR_CAST(obj);
vma = i915_vma_instance(obj, &engine->gt->ggtt->vm, NULL);
if (IS_ERR(vma)) {