Bound per-tile allocations in TIFF reader (#1215)#1216
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brendancol merged 1 commit intomasterfrom Apr 18, 2026
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`_check_dimensions` validates image dims but not tile dims. A TIFF claiming a 1x1 image with a 2^30 x 2^30 tile passes the guard and then asks the decompressor for terabytes. LZW allocates an `np.empty` of the claimed decompressed size, and the GPU path does `cupy.zeros(n_tiles * tile_bytes)`. Call `_check_dimensions` on the tile dims in `_read_tiles`, `_read_cog_http`, and `read_geotiff_gpu`. Reject zero tile dims before they reach the `math.ceil(width / tw)` division. Tests forge tile dims both at the `_read_tiles` level and the `open_geotiff` end-to-end level, and confirm real tile sizes (256, 512) still pass. Also records the geotiff audit in `.claude/sweep-security-state.json`.
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Summary
Fixes #1215.
The TIFF reader validates image dims but not tile dims. A TIFF with a 1x1 image and a 2^30 x 2^30 tile passes
_check_dimensionsand then makes the decompressor ask for terabytes. LZW doesnp.empty(expected_size); the GPU path doescupy.zeros(n_tiles * tile_bytes).Changes
_read_tiles,_read_cog_http, andread_geotiff_gpucall_check_dimensions(tw, th, samples, max_pixels)after reading tile dims from the IFD.ValueErrorbefore they can divide by zero inmath.ceil(width / tw).TestTileDimensionGuardcovers forged tile dims at the_read_tileslevel and throughopen_geotiff, plus a check that real tile sizes still pass..claude/sweep-security-state.jsonrecords the audit.Test plan
pytest xrspatial/geotiff/tests/test_security.py: 19 pass (13 existing, 4 new in the tile class, 2 VRT).pytest xrspatial/geotiff/tests/: 435 pass. 3 failures intest_features.py::TestPaletteare pre-existing (matplotlib deepcopy recursion); reproduce on master.