From e4d5dc218c4a1d1f555448825f5a8d7b1ac82959 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Wed, 5 Jul 2017 15:26:31 +0100 Subject: [PATCH] drm/i915: Check new context against kernel_context after reporting an error Avoid any pointer dereference in inspecting a potential PTR_ERR by checking for the error pointer before checking for an invalid context. Signed-off-by: Chris Wilson Reviewed-by: Tvrtko Ursulin Link: http://patchwork.freedesktop.org/patch/msgid/20170705142634.18554-1-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_gem_context.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index 2eb5d8203999..98d2ce98f467 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -571,14 +571,13 @@ int i915_gem_context_open(struct drm_i915_private *i915, mutex_lock(&i915->drm.struct_mutex); ctx = i915_gem_create_context(i915, file_priv); mutex_unlock(&i915->drm.struct_mutex); - - GEM_BUG_ON(i915_gem_context_is_kernel(ctx)); - if (IS_ERR(ctx)) { idr_destroy(&file_priv->context_idr); return PTR_ERR(ctx); } + GEM_BUG_ON(i915_gem_context_is_kernel(ctx)); + return 0; } -- 2.20.1