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soc: renesas: Add missing check for non-zero product register address 

commit 4194b583c1 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: 175f435f44 ("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>
5.4-rM2-2.2.x-imx-squashed
Geert Uytterhoeven 2019-10-16 16:33:06 +02:00 committed by Greg Kroah-Hartman
parent fe20bda153
commit f255ba7d63
1 changed files with 1 additions and 1 deletions
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2
drivers/soc/renesas/renesas-soc.c
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@ -326,7 +326,7 @@ static int __init renesas_soc_init(void)
if (np) {
chipid = of_iomap(np, 0);
of_node_put(np);
} else if (soc->id) {
} else if (soc->id && family->reg) {
chipid = ioremap(family->reg, 4);
}
if (chipid) {