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lib/generic-radix-tree.c: Don't overflow in peek()
[ Upstream commit 9492261 ] When we started spreading new inode numbers throughout most of the 64 bit inode space, that triggered some corner case bugs, in particular some integer overflows related to the radix tree code. Oops. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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