mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-08-05 16:54:27 +00:00
fc2ef5b6e1
Make use of the struct_size() helper instead of an open-coded version, in order to avoid any potential type mistakes or integer overflows that, in the worst scenario, could lead to heap overflows. Signed-off-by: luoqing <luoqing@kylinos.cn> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20250208013539.3586855-1-l1138897701@163.com
133 lines
2.7 KiB
C
133 lines
2.7 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright © 2016 Intel Corporation
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*/
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#include <linux/vmalloc.h>
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#include "mock_dmabuf.h"
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static struct sg_table *mock_map_dma_buf(struct dma_buf_attachment *attachment,
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enum dma_data_direction dir)
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{
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struct mock_dmabuf *mock = to_mock(attachment->dmabuf);
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struct sg_table *st;
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struct scatterlist *sg;
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int i, err;
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st = kmalloc(sizeof(*st), GFP_KERNEL);
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if (!st)
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return ERR_PTR(-ENOMEM);
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err = sg_alloc_table(st, mock->npages, GFP_KERNEL);
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if (err)
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goto err_free;
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sg = st->sgl;
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for (i = 0; i < mock->npages; i++) {
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sg_set_page(sg, mock->pages[i], PAGE_SIZE, 0);
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sg = sg_next(sg);
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}
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err = dma_map_sgtable(attachment->dev, st, dir, 0);
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if (err)
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goto err_st;
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return st;
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err_st:
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sg_free_table(st);
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err_free:
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kfree(st);
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return ERR_PTR(err);
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}
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static void mock_unmap_dma_buf(struct dma_buf_attachment *attachment,
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struct sg_table *st,
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enum dma_data_direction dir)
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{
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dma_unmap_sgtable(attachment->dev, st, dir, 0);
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sg_free_table(st);
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kfree(st);
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}
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static void mock_dmabuf_release(struct dma_buf *dma_buf)
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{
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struct mock_dmabuf *mock = to_mock(dma_buf);
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int i;
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for (i = 0; i < mock->npages; i++)
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put_page(mock->pages[i]);
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kfree(mock);
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}
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static int mock_dmabuf_vmap(struct dma_buf *dma_buf, struct iosys_map *map)
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{
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struct mock_dmabuf *mock = to_mock(dma_buf);
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void *vaddr;
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vaddr = vm_map_ram(mock->pages, mock->npages, 0);
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if (!vaddr)
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return -ENOMEM;
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iosys_map_set_vaddr(map, vaddr);
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return 0;
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}
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static void mock_dmabuf_vunmap(struct dma_buf *dma_buf, struct iosys_map *map)
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{
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struct mock_dmabuf *mock = to_mock(dma_buf);
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vm_unmap_ram(map->vaddr, mock->npages);
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}
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static int mock_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct *vma)
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{
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return -ENODEV;
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}
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static const struct dma_buf_ops mock_dmabuf_ops = {
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.map_dma_buf = mock_map_dma_buf,
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.unmap_dma_buf = mock_unmap_dma_buf,
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.release = mock_dmabuf_release,
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.mmap = mock_dmabuf_mmap,
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.vmap = mock_dmabuf_vmap,
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.vunmap = mock_dmabuf_vunmap,
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};
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static struct dma_buf *mock_dmabuf(int npages)
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{
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struct mock_dmabuf *mock;
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DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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struct dma_buf *dmabuf;
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int i;
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mock = kmalloc(struct_size(mock, pages, npages), GFP_KERNEL);
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if (!mock)
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return ERR_PTR(-ENOMEM);
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mock->npages = npages;
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for (i = 0; i < npages; i++) {
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mock->pages[i] = alloc_page(GFP_KERNEL);
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if (!mock->pages[i])
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goto err;
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}
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exp_info.ops = &mock_dmabuf_ops;
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exp_info.size = npages * PAGE_SIZE;
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exp_info.flags = O_CLOEXEC;
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exp_info.priv = mock;
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dmabuf = dma_buf_export(&exp_info);
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if (IS_ERR(dmabuf))
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goto err;
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return dmabuf;
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err:
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while (i--)
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put_page(mock->pages[i]);
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kfree(mock);
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return ERR_PTR(-ENOMEM);
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}
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