From: Dan Carpenter dan.carpenter@oracle.com
stable inclusion from stable-5.10.65 commit c062253748d8f56fbab6ca8e037502ed692df063 bugzilla: 182361 https://gitee.com/openeuler/kernel/issues/I4EH3U
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit e58430e1d4fd01b74475d2fbe2e25b5817b729a9 ]
There are a few bugs in this code. 1) No checks for whether dma_alloc_attrs() or __get_free_pages() failed. 2) If video_register_device() fails it doesn't clean up the dma attrs or the free pages. 3) The video_device_release() function frees "vfd" which leads to a use after free on the next line. The call to video_unregister_device() is not required so I have just removed that.
Fixes: f7e7b48e6d79 ("[media] rockchip/rga: v4l2 m2m support") Reported-by: Dongliang Mu mudongliangabcd@gmail.com Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl Signed-off-by: Mauro Carvalho Chehab mchehab+huawei@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com
Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/media/platform/rockchip/rga/rga.c | 27 ++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-)
diff --git a/drivers/media/platform/rockchip/rga/rga.c b/drivers/media/platform/rockchip/rga/rga.c index bf3fd71ec3af..6759091b15e0 100644 --- a/drivers/media/platform/rockchip/rga/rga.c +++ b/drivers/media/platform/rockchip/rga/rga.c @@ -863,12 +863,12 @@ static int rga_probe(struct platform_device *pdev) if (IS_ERR(rga->m2m_dev)) { v4l2_err(&rga->v4l2_dev, "Failed to init mem2mem device\n"); ret = PTR_ERR(rga->m2m_dev); - goto unreg_video_dev; + goto rel_vdev; }
ret = pm_runtime_resume_and_get(rga->dev); if (ret < 0) - goto unreg_video_dev; + goto rel_vdev;
rga->version.major = (rga_read(rga, RGA_VERSION_INFO) >> 24) & 0xFF; rga->version.minor = (rga_read(rga, RGA_VERSION_INFO) >> 20) & 0x0F; @@ -882,11 +882,23 @@ static int rga_probe(struct platform_device *pdev) rga->cmdbuf_virt = dma_alloc_attrs(rga->dev, RGA_CMDBUF_SIZE, &rga->cmdbuf_phy, GFP_KERNEL, DMA_ATTR_WRITE_COMBINE); + if (!rga->cmdbuf_virt) { + ret = -ENOMEM; + goto rel_vdev; + }
rga->src_mmu_pages = (unsigned int *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 3); + if (!rga->src_mmu_pages) { + ret = -ENOMEM; + goto free_dma; + } rga->dst_mmu_pages = (unsigned int *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, 3); + if (rga->dst_mmu_pages) { + ret = -ENOMEM; + goto free_src_pages; + }
def_frame.stride = (def_frame.width * def_frame.fmt->depth) >> 3; def_frame.size = def_frame.stride * def_frame.height; @@ -894,7 +906,7 @@ static int rga_probe(struct platform_device *pdev) ret = video_register_device(vfd, VFL_TYPE_VIDEO, -1); if (ret) { v4l2_err(&rga->v4l2_dev, "Failed to register video device\n"); - goto rel_vdev; + goto free_dst_pages; }
v4l2_info(&rga->v4l2_dev, "Registered %s as /dev/%s\n", @@ -902,10 +914,15 @@ static int rga_probe(struct platform_device *pdev)
return 0;
+free_dst_pages: + free_pages((unsigned long)rga->dst_mmu_pages, 3); +free_src_pages: + free_pages((unsigned long)rga->src_mmu_pages, 3); +free_dma: + dma_free_attrs(rga->dev, RGA_CMDBUF_SIZE, rga->cmdbuf_virt, + rga->cmdbuf_phy, DMA_ATTR_WRITE_COMBINE); rel_vdev: video_device_release(vfd); -unreg_video_dev: - video_unregister_device(rga->vfd); unreg_v4l2_dev: v4l2_device_unregister(&rga->v4l2_dev); err_put_clk: