GH-1261: Reject out-of-range dictionary indices in decode - #1262
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GH-1261: Reject out-of-range dictionary indices in decode#1262Arawoof06 wants to merge 1 commit into
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Arawoof06
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August 18, 2026 12:11
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DictionaryEncoder.retrieveIndexVector guards each index with indexAsInt > dictionaryCount, but valid indices run 0..dictionaryCount-1, so an index equal to the count reads one slot past the dictionary vector and a negative index from a signed index type is not caught at all; both reach copyValueSafe. The index vector is decoded straight from an IPC payload, so a crafted dictionary-encoded batch reads out of bounds of the dictionary buffers when arrow.enable_unsafe_memory_access is set. Tightening the bound to reject negative indices and indices past the count also covers the list and struct sub-field decoders, which go through the same helper.
Closes #1261.