GH-1217: validate view data offsets in BaseVariableWidthViewVector - #1218
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GH-1217: validate view data offsets in BaseVariableWidthViewVector#1218Arawoof06 wants to merge 1 commit into
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Arawoof06
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wgtmac
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July 6, 2026 07:18
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Could a maintainer add the bug-fix label? The format check is failing on missing labels and I can't set it myself. |
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What's Changed
Utf8View and BinaryView values longer than 12 bytes live in a separate data buffer, with the data-buffer index and offset stored inline in the view; when a vector is read from an IPC stream those fields come from untrusted input. BaseVariableWidthViewVector dereferenced them without checking that the index is present or that offset+length stays inside the data buffer, so a crafted view reads past the buffer (and returns arbitrary native heap when arrow.enable_unsafe_memory_access is set). Routed every out-of-line dereference (get, getDataPointer, hashCode, copyFrom, splitAndTransfer) through one getValidatedDataBuffer check so a bad view is rejected at the source rather than in each caller.
Closes #1217.