CVE-2026-80678

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

i2c: imx: Fix slave registration race and error handling

In i2c_imx_reg_slave(), the slave pointer was assigned before

pm_runtime_resume_and_get(). If pm_runtime_resume_and_get() failed,

the error path returned without clearing i2c_imx->slave, leaving it

non-NULL and causing all subsequent registration attempts to fail

with -EBUSY.

Additionally, because this driver uses a shared IRQ, the interrupt

handler i2c_imx_isr() can execute concurrently and, after acquiring

slave_lock, dereference i2c_imx->slave. The previous fix attempt

added a lockless i2c_imx->slave = NULL on the error path, but that

could race with the ISR under the lock and still cause a NULL pointer

dereference.

Fix both issues by deferring the assignment of i2c_imx->slave and

i2c_imx->last_slave_event to after a successful resume, and by

performing the assignment inside the slave_lock critical section.

This guarantees that the slave pointer is never left stale on the

error path and is always valid when observed by the interrupt handler.