i3c: master: mipi-i3c-hci: Fix a kernel panic for accessing DAT_data.

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[ Upstream commit b53e9758a3 ]

The `i3c_master_bus_init` function may attach the I2C devices before the
I3C bus initialization. In this flow, the DAT `alloc_entry`` will be used
before the DAT `init`. Additionally, if the `i3c_master_bus_init` fails,
the DAT `cleanup` will execute before the device is detached, which will
execue DAT `free_entry` function. The above scenario can cause the driver
to use DAT_data when it is NULL.

Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Link: https://lore.kernel.org/r/20231023080237.560936-1-billy_tsai@aspeedtech.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Billy Tsai 2023-10-23 16:02:37 +08:00 • committed by Greg Kroah-Hartman

parent 472bd47874

commit e64d23dc65

1 changed files with 19 additions and 10 deletions

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drivers/i3c/master/mipi-i3c-hci/dat_v1.c

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