Commits
Geert Uytterhoeven committed f255ba7d639
soc: renesas: Add missing check for non-zero product register address commit 4194b583c104922c6141d6610bfbce26847959df upstream. If the DTB for a device with an RZ/A2 SoC lacks a device node for the BSID register, the ID validation code falls back to using a register at address 0x0, which leads to undefined behavior (e.g. reading back a random value). This could be fixed by letting fam_rza2.reg point to the actual BSID register. However, the hardcoded fallbacks were meant for backwards compatibility with old DTBs only, not for new SoCs. Hence fix this by validating renesas_family.reg before using it. Fixes: 175f435f44b724e3 ("soc: renesas: identify RZ/A2") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/20191016143306.28995-1-geert+renesas@glider.be Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>