40f7932e8c
[ 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: 6455a8a84bdf ("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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.