Hi,
During global rework of power supply register API I found possible
issues related to not checked return value.
The power_supply_register() return value was ignored and during driver
removal the power supply was always unregistered. This theoretically
could lead to invalid memory accesses. However I did not reproduce
the issue (only code analysis).
Affected drivers:
1. twl4030_madc
2. compal-laptop
3. ipaq_micro_battery
I prepared patches but DID NOT test them. Only compilation + sparse
+ smatch + coccicheck.
I am kindly asking for review and testing.
P.S. The acpi/sbs.c driver has the same issue. Before unregistering
power supply it checks if sbs->charger.dev is non-NULL... which will
be non-NULL in most error-paths. However the driver is little more
complicated so fixing this without doing tests would be very
error-prone.
Best regards,
Krzysztof
Krzysztof Kozlowski (4):
power_supply: twl4030_madc: Check return value of
power_supply_register
compal-laptop: Check return value of power_supply_register
power_supply: ipaq_micro_battery: Fix leaking workqueue
power_supply: ipaq_micro_battery: Check return values in probe
drivers/platform/x86/compal-laptop.c | 7 ++++++-
drivers/power/ipaq_micro_battery.c | 22 ++++++++++++++++++++--
drivers/power/twl4030_madc_battery.c | 7 +++++--
3 files changed, 31 insertions(+), 5 deletions(-)
--
1.9.1
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