i3c: master: Fix potential UAF in i3c_device_match()

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i3c_device_match() dereferences i3cdev->desc without holding the bus
normal-use lock.  Since the descriptor pointer can be replaced
concurrently, the dereference can race with descriptor replacement and
result in a use-after-free.

Protect access to i3cdev->desc with the normal-use lock.  While the lock
is held, the descriptor is guaranteed to remain valid, so the NULL check
is also unnecessary and can be removed.

This change depends on "i3c: master: Fix recursive locking during device
registration".  Prior to that change, taking the normal-use lock in
i3c_device_match() could recurse on bus->lock during device
registration.

Fixes: 3456baa211 ("i3c: master: match I3C device through DT and ACPI")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260807145638.168865-8-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

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Adrian Hunter 2026-08-07 17:56:31 +03:00 • committed by Alexandre Belloni

parent e5e8dd2e95

commit f44d3b1532

1 changed files with 3 additions and 1 deletions

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drivers/i3c/master.c

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