linux-kernel - [PATCH] drm/lima: fix a memleak in lima_heap

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Date: Fri, 12 Jan 2024 16:47:50 +0800
From: Zhipeng Lu <alexious@....edu.cn>
To: alexious@....edu.cn
Cc: Qiang Yu <yuq825@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	Vasily Khoruzhick <anarsoul@...il.com>,
	dri-devel@...ts.freedesktop.org,
	lima@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/lima: fix a memleak in lima_heap_alloc

When lima_vm_map_bo fails, the resources need to be deallocated, or
there will be memleaks.

Fixes: 6aebc51d7aef ("drm/lima: support heap buffer creation")
Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
---
 drivers/gpu/drm/lima/lima_gem.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c
index 4f9736e5f929..824ed22141c7 100644
--- a/drivers/gpu/drm/lima/lima_gem.c
+++ b/drivers/gpu/drm/lima/lima_gem.c
@@ -92,8 +92,13 @@ int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm)
 
 	if (vm) {
 		ret = lima_vm_map_bo(vm, bo, old_size >> PAGE_SHIFT);
-		if (ret)
+		if (ret) {
+			dma_unmap_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0);
+			sg_free_table(&sgt);
+			kfree(bo->base.sgt);
+			bo->base.sgt = NULL;
 			return ret;
+		}
 	}
 
 	bo->heap_size = new_size;
-- 
2.34.1