Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 before 754bc62f72fd64b202462367134ac8ce95b005de; affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 before cfdf6e13518589f911b7eace6ccb788e4ed87397; affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 before b9f6f4883b9ac86654e75899d0dbf8a7a96ad5d8; affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 before d6748f6802f3eebafaa16a5e5dcfbfb9b3bc173f; affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 before 12a4f0950a158d98552cbaeacc35edccd8d975fa; affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 before 614ca6594e301ff682999797c2216e9685558a2b; affected f7414cd6923fd7f78e57086fc964ba2dc25db5c1 before d64ec362c369bbc33833f7936d5f3a706b0d5c45 |
| Linux / Linux | affected 5.11; unaffected 0 before 5.11; unaffected 5.15.217 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.151 through 6.6.*; unaffected 6.12.103 through 6.12.*; unaffected 6.18.44 through 6.18.*; unaffected 7.1.8 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/754bc62f72fd64b202462367134ac8ce95b005de
- https://git.kernel.org/stable/c/cfdf6e13518589f911b7eace6ccb788e4ed87397
- https://git.kernel.org/stable/c/b9f6f4883b9ac86654e75899d0dbf8a7a96ad5d8
- https://git.kernel.org/stable/c/d6748f6802f3eebafaa16a5e5dcfbfb9b3bc173f
- https://git.kernel.org/stable/c/12a4f0950a158d98552cbaeacc35edccd8d975fa
- https://git.kernel.org/stable/c/614ca6594e301ff682999797c2216e9685558a2b
- https://git.kernel.org/stable/c/d64ec362c369bbc33833f7936d5f3a706b0d5c45
ADP enrichment
No English description supplied.
No references supplied.