CVE-2024-43098

In the Linux kernel, the following vulnerability has been resolved:

i3c: Use i3cdev->desc->info instead of calling i3cdeviceget_info() to avoid deadlock

A deadlock may happen since the i3cmasterregister() acquires &i3cbus->lock twice. See the log below. Use i3cdev->desc->info instead of calling i3cdeviceinfo() to avoid acquiring the lock twice.

v2: - Modified the title and commit message

============================================ WARNING: possible recursive locking detected

6.11.0-mainline

init/1 is trying to acquire lock: f1ffff80a6a40dc0 (&i3cbus->lock){++++}-{3:3}, at: i3cbusnormaluse_lock

but task is already holding lock: f1ffff80a6a40dc0 (&i3cbus->lock){++++}-{3:3}, at: i3cmasterregister

other info that might help us debug this: Possible unsafe locking scenario:

   CPU0
   ----

lock(&i3cbus->lock); lock(&i3cbus->lock);

*** DEADLOCK ***

May be due to missing lock nesting notation

2 locks held by init/1: #0: fcffff809b6798f8 (&dev->mutex){....}-{3:3}, at: _driverattach #1: f1ffff80a6a40dc0 (&i3cbus->lock){++++}-{3:3}, at: i3cmasterregister

stack backtrace: CPU: 6 UID: 0 PID: 1 Comm: init Call trace: dumpbacktrace+0xfc/0x17c showstack+0x18/0x28 dumpstacklvl+0x40/0xc0 dumpstack+0x18/0x24 printdeadlock_bug+0x388/0x390 __lockacquire+0x18bc/0x32ec lockacquire+0x134/0x2b0 downread+0x50/0x19c i3cbusnormaluselock+0x14/0x24 i3cdevicegetinfo+0x24/0x58 i3cdeviceuevent+0x34/0xa4 devuevent+0x310/0x384 kobjectueventenv+0x244/0x414 kobjectuevent+0x14/0x20 deviceadd+0x278/0x460 deviceregister+0x20/0x34 i3cmasterregisternewi3cdevs+0x78/0x154 i3cmasterregister+0x6a0/0x6d4 mtki3cmasterprobe+0x3b8/0x4d8 platformprobe+0xa0/0xe0 really_probe+0x114/0x454 __driverprobedevice+0xa0/0x15c driverprobedevice+0x3c/0x1ac __driverattach+0xc4/0x1f0 busforeachdev+0x104/0x160 driverattach+0x24/0x34 busadddriver+0x14c/0x294 driverregister+0x68/0x104 __platformdriverregister+0x20/0x30 initmodule+0x20/0xfe4 dooneinitcall+0x184/0x464 doinitmodule+0x58/0x1ec loadmodule+0xefc/0x10c8 __arm64sysfinitmodule+0x238/0x33c invokesyscall+0x58/0x10c el0svccommon+0xa8/0xdc doel0svc+0x1c/0x28 el0svc+0x50/0xac el0t64synchandler+0x70/0xbc el0t64sync+0x1a8/0x1ac