From: Wei Yongjun <weiyongjun1@xxxxxxxxxx> [ Upstream commit bab76514aca36bc513224525d5598da676938218 ] KASAN report slab-out-of-bounds in __regmap_init as follows: BUG: KASAN: slab-out-of-bounds in __regmap_init drivers/base/regmap/regmap.c:841 Read of size 1 at addr ffff88803678cdf1 by task xrun/9137 CPU: 0 PID: 9137 Comm: xrun Tainted: G W 5.18.0-rc2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0xe8/0x15a lib/dump_stack.c:88 print_report.cold+0xcd/0x69b mm/kasan/report.c:313 kasan_report+0x8e/0xc0 mm/kasan/report.c:491 __regmap_init+0x4540/0x4ba0 drivers/base/regmap/regmap.c:841 __devm_regmap_init+0x7a/0x100 drivers/base/regmap/regmap.c:1266 __devm_regmap_init_i2c+0x65/0x80 drivers/base/regmap/regmap-i2c.c:394 da9121_i2c_probe+0x386/0x6d1 drivers/regulator/da9121-regulator.c:1039 i2c_device_probe+0x959/0xac0 drivers/i2c/i2c-core-base.c:563 This happend when da9121 device is probe by da9121_i2c_id, but with invalid dts. Thus, chip->subvariant_id is set to -EINVAL, and later da9121_assign_chip_model() will access 'regmap' without init it. Fix it by return -EINVAL from da9121_assign_chip_model() if 'chip->subvariant_id' is invalid. Fixes: f3fbd5566f6a ("regulator: da9121: Add device variants") Reported-by: Hulk Robot <hulkci@xxxxxxxxxx> Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx> Reviewed-by: Adam Ward <Adam.Ward.Opensource@xxxxxxxxxxx> Link: https://lore.kernel.org/r/20220421090335.1876149-1-weiyongjun1@xxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/regulator/da9121-regulator.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/regulator/da9121-regulator.c b/drivers/regulator/da9121-regulator.c index 0a4fd449c27d..3315994d7e31 100644 --- a/drivers/regulator/da9121-regulator.c +++ b/drivers/regulator/da9121-regulator.c @@ -936,6 +936,8 @@ static int da9121_assign_chip_model(struct i2c_client *i2c, chip->variant_id = DA9121_TYPE_DA9220_DA9132; regmap = &da9121_2ch_regmap_config; break; + default: + return -EINVAL; } /* Set these up for of_regulator_match call which may want .of_map_modes */ -- 2.35.1