linux-kernel - [PATCH] drm/i915/gem: Add check for bitmap

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Date:   Fri, 28 Jul 2023 09:58:46 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, tvrtko.ursulin@...ux.intel.com,
        airlied@...il.com, daniel@...ll.ch, robdclark@...omium.org,
        lucas.demarchi@...el.com, thomas.hellstrom@...ux.intel.com,
        chris@...is-wilson.co.uk
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] drm/i915/gem: Add check for bitmap_zalloc()

Add the check for the return value of bitmap_zalloc() in order to
guarantee the success of the allocation.

Fixes: e9b73c67390a ("drm/i915: Reduce memory pressure during shrinker by preallocating swizzle pages")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/gpu/drm/i915/gem/i915_gem_tiling.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_tiling.c b/drivers/gpu/drm/i915/gem/i915_gem_tiling.c
index a049ca0b7980..e9cf99d95966 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_tiling.c
@@ -311,6 +311,11 @@ i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
 		if (!obj->bit_17) {
 			obj->bit_17 = bitmap_zalloc(obj->base.size >> PAGE_SHIFT,
 						    GFP_KERNEL);
+			if (!obj->bit_17) {
+				i915_gem_object_unlock(obj);
+				i915_gem_object_release_mmap_gtt(obj);
+				return -ENOMEM;
+			}
 		}
 	} else {
 		bitmap_free(obj->bit_17);
-- 
2.25.1