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H A D | regcache-maple.c | 3af6c5ac Wed Mar 27 06:44:06 CDT 2024 Richard Fitzgerald <rf@opensource.cirrus.com> regmap: maple: Fix cache corruption in regcache_maple_drop()
[ Upstream commit 00bb549d7d63a21532e76e4a334d7807a54d9f31 ]
When keeping the upper end of a cache block entry, the entry[] array must be indexed by the offset from the base register of the block, i.e. max - mas.index.
The code was indexing entry[] by only the register address, leading to an out-of-bounds access that copied some part of the kernel memory over the cache contents.
This bug was not detected by the regmap KUnit test because it only tests with a block of registers starting at 0, so mas.index == 0.
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com> Fixes: f033c26de5a5 ("regmap: Add maple tree based register cache") Link: https://msgid.link/r/20240327114406.976986-1-rf@opensource.cirrus.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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