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| author | Dmitry Osipenko <dmitry.osipenko@collabora.com> | 2022-11-10 23:13:45 +0300 |
|---|---|---|
| committer | Dmitry Osipenko <dmitry.osipenko@collabora.com> | 2022-11-11 23:49:47 +0300 |
| commit | 39ce252918712180f5a64853920a320981dac94b (patch) | |
| tree | 276027d84b0c6b8e65c8c3917068279b08561707 /drivers/gpu/drm/i915 | |
| parent | 8526e973647e1bf77dadf894a36aefd4fd1b8a3f (diff) | |
| download | linux-39ce252918712180f5a64853920a320981dac94b.tar.bz2 | |
drm: Assert held reservation lock for dma-buf mmapping
When userspace mmaps dma-buf's fd, the dma-buf reservation lock must be
held. Add locking sanity checks to the dma-buf mmaping callbacks of DRM
drivers to ensure that the locking assumptions won't regress in future.
Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221110201349.351294-3-dmitry.osipenko@collabora.com
Diffstat (limited to 'drivers/gpu/drm/i915')
| -rw-r--r-- | drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c index ec6f7ae47783..9322ac29008b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c @@ -97,6 +97,8 @@ static int i915_gem_dmabuf_mmap(struct dma_buf *dma_buf, struct vm_area_struct * struct drm_i915_private *i915 = to_i915(obj->base.dev); int ret; + dma_resv_assert_held(dma_buf->resv); + if (obj->base.size < vma->vm_end - vma->vm_start) return -EINVAL; |