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power: supply: max17040: fix null-ptr-deref in max17040_probe()

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[ Upstream commit 1d422ecfc48ee683ae1ccc9217764f6310c0ffce ]

Add check the return value of devm_regmap_init_i2c(), otherwise
later access may cause null-ptr-deref as follows:

KASAN: null-ptr-deref in range [0x0000000000000360-0x0000000000000367]
RIP: 0010:regmap_read+0x33/0x170
Call Trace:
  max17040_probe+0x61b/0xff0 [max17040_battery]
 ? write_comp_data+0x2a/0x90
 ? max17040_set_property+0x1d0/0x1d0 [max17040_battery]
 ? tracer_hardirqs_on+0x33/0x520
 ? __sanitizer_cov_trace_pc+0x1d/0x50
 ? _raw_spin_unlock_irqrestore+0x4b/0x60
 ? trace_hardirqs_on+0x63/0x2d0
 ? write_comp_data+0x2a/0x90
 ? __sanitizer_cov_trace_pc+0x1d/0x50
 ? max17040_set_property+0x1d0/0x1d0 [max17040_battery]
 i2c_device_probe+0xa31/0xbe0

Fixes: 6455a8a84b ("power: supply: max17040: Use regmap i2c")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yang Yingliang 2021-10-08 14:31:50 +08:00 committed by Greg Kroah-Hartman
parent c553d67301
commit 12c4673204
1 changed files with 2 additions and 0 deletions
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2
drivers/power/supply/max17040_battery.c
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@ -482,6 +482,8 @@ static int max17040_probe(struct i2c_client *client,
chip->client = client;
chip->regmap = devm_regmap_init_i2c(client, &max17040_regmap);
chip->pdata = client->dev.platform_data;
if (IS_ERR(chip->regmap))
return PTR_ERR(chip->regmap);
chip_id = (enum chip_id) id->driver_data;
if (client->dev.of_node) {
ret = max17040_get_of_data(chip);