regmap: maple: Fix cache corruption in regcache_maple_drop()

jira LE-1907
cve CVE-2024-36019
Rebuild_History Non-Buildable kernel-5.14.0-427.35.1.el9_4
commit-author Richard Fitzgerald <rf@opensource.cirrus.com>
commit 00bb549

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: f033c26 ("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>
(cherry picked from commit 00bb549)
	Signed-off-by: Jonathan Maple <jmaple@ciq.com>

Author: PlaidCat

drivers/base/regmap/regcache-maple.c

@@ -145,7 +145,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
 			upper_index = max + 1;
 			upper_last = mas.last;
 
-			upper = kmemdup(&entry[max + 1],
+			upper = kmemdup(&entry[max - mas.index + 1],
 					((mas.last - max) *
 					 sizeof(unsigned long)),
 					map->alloc_flags);