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authorPeng Zhang <zhangpeng.00@bytedance.com>2023-04-19 17:36:25 +0800
committerAndrew Morton <akpm@linux-foundation.org>2023-04-21 14:52:04 -0700
commit29ad6bb313487370f9dfe5441fc8982593b6384e (patch)
tree583845857f3e70bfd9c232f1a793f01cc03ed850 /init
parent53156443a30368c0759c22e54a8d5cacc1b543cc (diff)
maple_tree: fix allocation in mas_sparse_area()
In the case of reverse allocation, mas->index and mas->last do not point to the correct allocation range, which will cause users to get incorrect allocation results, so fix it. If the user does not use it in a specific way, this bug will not be triggered. This is a bug, but only VMA uses it now, the way VMA is used now will not trigger it. There is a possibility that a user will trigger it in the future. Also re-check whether the size is still satisfied after the lower bound was increased, which is a corner case and is incorrect in previous versions. Link: https://lkml.kernel.org/r/20230419093625.99201-1-zhangpeng.00@bytedance.com Fixes: 54a611b60590 ("Maple Tree: add new data structure") Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com> Cc: Liam R. Howlett <Liam.Howlett@Oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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