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bpo-45521: Fix a bug in the obmalloc radix tree code. #29051

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Merged
merged 1 commit into from
Oct 21, 2021
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bpo-45521: Fix a bug in the obmalloc radix tree code. #29051

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2021-10-18-22-40-33.bpo-45521.GdMiuW.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
Fix a bug in the obmalloc radix tree code. On 64-bit machines, the bug
causes the tree to hold 46-bits of virtual addresses, rather than the
intended 48-bits.
2 changes: 1 addition & 1 deletion Objects/obmalloc.c
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Expand Up @@ -1341,7 +1341,7 @@ _Py_GetAllocatedBlocks(void)

#define MAP_TOP_BITS INTERIOR_BITS
#define MAP_TOP_LENGTH (1 << MAP_TOP_BITS)
#define MAP_TOP_MASK (MAP_BOT_LENGTH - 1)
#define MAP_TOP_MASK (MAP_TOP_LENGTH - 1)

#define MAP_MID_BITS INTERIOR_BITS
#define MAP_MID_LENGTH (1 << MAP_MID_BITS)
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