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[ Upstream commit5901eda2ed] In __of_find_n_match_cpu_property(), checking the variable ac for 0 won't prevent a possible overflow when multiplying it by sizeof(*cell). Besides, of_read_number() (called in the *for* loop) can't return correct result if that variable (which equals the #address-cells prop's value) exceeds 2, so additionally checking for that seems logical... Found by Linux Verification Center (linuxtesting.org) with the Svace static analysis tool. Fixes:f3cea45a77("of: Fix iteration bug over CPU reg properties") Signed-off-by: Sergey Shtylyov <s.shtylyov@auroraos.dev> Link: https://patch.msgid.link/0c7bf7e9-887c-42d5-bcfb-0ba7fe1e70b6@auroraos.dev Signed-off-by: Rob Herring (Arm) <robh@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>