[PATCH 6.1 250/451] drm/lima: fix a memleak in lima_heap_alloc

Sasha Levin
2024-03-24T23:16:11Z

From: Zhipeng Lu <alexious@zju.edu.cn>

[ Upstream commit 04ae3eb470e52a3c41babe85ff8cee195e4dcbea ]

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@zju.edu.cn>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240117071328.3811480-1-alexious@zju.edu.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/lima/lima_gem.c | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c
index 0f1ca0b0db495..d72c5bf4e5ac1 100644
--- a/drivers/gpu/drm/lima/lima_gem.c
+++ b/drivers/gpu/drm/lima/lima_gem.c
@@ -75,29 +75,34 @@ int lima_heap_alloc(struct lima_bo *bo, struct lima_vm *vm)
} else {
bo->base.sgt = kmalloc(sizeof(*bo->base.sgt), GFP_KERNEL);
if (!bo->base.sgt) {
- sg_free_table(&sgt);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_out0;
}
}

ret = dma_map_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0);
- if (ret) {
- sg_free_table(&sgt);
- kfree(bo->base.sgt);
- bo->base.sgt = NULL;
- return ret;
- }
+ if (ret)
+ goto err_out1;

*bo->base.sgt = sgt;

if (vm) {
ret = lima_vm_map_bo(vm, bo, old_size >> PAGE_SHIFT);
if (ret)
- return ret;
+ goto err_out2;
}

bo->heap_size = new_size;
return 0;
+
+err_out2:
+ dma_unmap_sgtable(dev, &sgt, DMA_BIDIRECTIONAL, 0);
+err_out1:
+ kfree(bo->base.sgt);
+ bo->base.sgt = NULL;
+err_out0:
+ sg_free_table(&sgt);
+ return ret;
}

int lima_gem_create_handle(struct drm_device *dev, struct drm_file *file,
--
2.43.0