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| author | Thomas Hellström <thomas.hellstrom@linux.intel.com> | 2025-03-07 13:01:09 +0300 |
|---|---|---|
| committer | Thomas Hellström <thomas.hellstrom@linux.intel.com> | 2025-03-08 14:43:05 +0300 |
| commit | 70e5043ba85eae199b232e39921abd706b5c1fa4 (patch) | |
| tree | 53f026ec1b771e1ebb6c5220c6e6e2561d967658 | |
| parent | fc858ddf9c68696537cec530d2d48bf6ed06ea92 (diff) | |
| download | linux-70e5043ba85eae199b232e39921abd706b5c1fa4.tar.xz | |
drm/xe/userptr: Fix an incorrect assert
The assert incorrectly checks the total length processed which
can in fact be greater than the number of pages. Fix.
Fixes: ea3e66d280ce ("drm/xe/hmm: Don't dereference struct page pointers without notifier lock")
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250307100109.21397-1-thomas.hellstrom@linux.intel.com
| -rw-r--r-- | drivers/gpu/drm/xe/xe_hmm.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/xe/xe_hmm.c b/drivers/gpu/drm/xe/xe_hmm.c index 392102515f3d..c3cc0fa105e8 100644 --- a/drivers/gpu/drm/xe/xe_hmm.c +++ b/drivers/gpu/drm/xe/xe_hmm.c @@ -138,13 +138,17 @@ static int xe_build_sg(struct xe_device *xe, struct hmm_range *range, i += size; if (unlikely(j == st->nents - 1)) { + xe_assert(xe, i >= npages); if (i > npages) size -= (i - npages); + sg_mark_end(sgl); + } else { + xe_assert(xe, i < npages); } + sg_set_page(sgl, page, size << PAGE_SHIFT, 0); } - xe_assert(xe, i == npages); return dma_map_sgtable(dev, st, write ? DMA_BIDIRECTIONAL : DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_NO_KERNEL_MAPPING); |