diff options
| author | Xiyu Yang | 2021-07-19 13:58:51 +0800 |
|---|---|---|
| committer | Inki Dae | 2021-08-22 01:56:38 +0900 |
| commit | 8c27cc5b90ed00ed0dc5956b99e455a494ac8970 (patch) | |
| tree | 0ef8b02a7a1b0b9ef838b1234975ff0d0893449e /drivers/gpu/drm/exynos | |
| parent | b74a29fac6de62f39b594e8f545b3a26db7edb5e (diff) | |
drm/exynos: Convert from atomic_t to refcount_t on g2d_cmdlist_userptr->refcount
refcount_t type and corresponding API can protect refcounters from
accidental underflow and overflow and further use-after-free situations.
Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Diffstat (limited to 'drivers/gpu/drm/exynos')
| -rw-r--r-- | drivers/gpu/drm/exynos/exynos_drm_g2d.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index 0ed665501ac4..b00230626c6a 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c @@ -4,6 +4,7 @@ * Authors: Joonyoung Shim <jy0922.shim@samsung.com> */ +#include <linux/refcount.h> #include <linux/clk.h> #include <linux/component.h> #include <linux/delay.h> @@ -208,7 +209,7 @@ struct g2d_cmdlist_userptr { struct page **pages; unsigned int npages; struct sg_table *sgt; - atomic_t refcount; + refcount_t refcount; bool in_pool; bool out_of_list; }; @@ -386,9 +387,9 @@ static void g2d_userptr_put_dma_addr(struct g2d_data *g2d, if (force) goto out; - atomic_dec(&g2d_userptr->refcount); + refcount_dec(&g2d_userptr->refcount); - if (atomic_read(&g2d_userptr->refcount) > 0) + if (refcount_read(&g2d_userptr->refcount) > 0) return; if (g2d_userptr->in_pool) @@ -436,7 +437,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d, * and different size. */ if (g2d_userptr->size == size) { - atomic_inc(&g2d_userptr->refcount); + refcount_inc(&g2d_userptr->refcount); *obj = g2d_userptr; return &g2d_userptr->dma_addr; @@ -461,7 +462,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d, if (!g2d_userptr) return ERR_PTR(-ENOMEM); - atomic_set(&g2d_userptr->refcount, 1); + refcount_set(&g2d_userptr->refcount, 1); g2d_userptr->size = size; start = userptr & PAGE_MASK; |