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maple_tree: fix get wrong data_end in mtree_lookup_walk() 

if (likely(offset > end))
	max = pivots[offset];

The above code should be changed to if (likely(offset < end)), which is
correct.  This affects the correctness of ma_data_end().  Now it seems
that the final result will not be wrong, but it is best to change it. 
This patch does not change the code as above, because it simplifies the
code by the way.

Link: https://lkml.kernel.org/r/20230314124203.91572-1-zhangpeng.00@bytedance.com
Link: https://lkml.kernel.org/r/20230314124203.91572-2-zhangpeng.00@bytedance.com
Fixes: 54a611b605 ("Maple Tree: add new data structure")
Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Peng Zhang 2023-03-14 20:42:01 +08:00 committed by Andrew Morton
parent 6fe7d6b992
commit ec07967d75
1 changed files with 5 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
lib/maple_tree.c
View File

@ -3941,18 +3941,13 @@ static inline void *mtree_lookup_walk(struct ma_state *mas)
end = ma_data_end(node, type, pivots, max);
if (unlikely(ma_dead_node(node)))
goto dead_node;
if (pivots[offset] >= mas->index)
goto next;
do {
offset++;
} while ((offset < end) && (pivots[offset] < mas->index));
if (pivots[offset] >= mas->index) {
max = pivots[offset];
break;
}
} while (++offset < end);
if (likely(offset > end))
max = pivots[offset];
next:
slots = ma_slots(node, type);
next = mt_slot(mas->tree, slots, offset);
if (unlikely(ma_dead_node(node)))