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 y0173fGp 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000252, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: * Wei Yang [250207 20:26]: The subject of this patch set makes the issue sound much more sever than it is. It currently sounds like a memory leak or a UAF, which isn't the case. The root node may remain usable for the duration of the rcu window if it's a leaf node. The impact is pretty minor - you may see the old data on calls that happen in the same rcu window - which is the case anyways. You should also say maple_tree: in the subject since this is going to linux-mm. Not a really big deal since each patch in the series specifies the maple tree. > Per my understanding, on destroy we should set each node dead. But current > code miss this when the maple tree has only the root node. > > The reason is mt_destroy_walk() leverage mte_destroy_descend() to set > node dead, but this is skipped since the only root node is a leaf. > > Patch 1 fixes this. > > When adding a test case, I found we always get the new value even we leave the > old root node not dead. It turns out we always re-walk the tree in mas_walk(). > It looks like a typo on the status check of mas_walk(). > > Patch 2 fixes this. > > Patch 3 add a test case to assert retrieving new value when overwriting the > whole range to a tree with only root node > > Wei Yang (3): > maple_tree: may miss to set node dead on destroy > maple_tree: restart walk on correct status > maple_tree: assert retrieving new value on a tree with only root node > > lib/maple_tree.c | 4 +++- > tools/testing/radix-tree/maple.c | 24 ++++++++++++++++++++++++ > 2 files changed, 27 insertions(+), 1 deletion(-) > > -- > 2.34.1 >