Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: media: v4l2-fwnode: Fix subdev owner overwritten in v4l2_async_register_subdev_sensor() The v4l2 helper v4l2_async_register_subdev_sensor() calls v4l2_async_register_subdev(), which is a macro that expands to __v4l2_async_register_subdev(sd,THIS_MODULE). Since the macro is expanded inside v4l2-fwnode.c, THIS_MODULE resolves to the v4l2-fwnode module rather than the sensor driver module that originally set sd->owner. When v4l2-fwnode is built-in, THIS_MODULE evaluates to NULL, which then overwrites the sensor driver's owner with NULL. This causes the problem that the sensor module's reference count is never incremented during async registration, so the module can be removed while the subdevice is still in use by a notifier (e.g., a CSI-2 receiver bridge driver). Fix this by renaming v4l2_async_register_subdev_sensor() to __v4l2_async_register_subdev_sensor() with an added explicit module argument and introducing a wrapper macro: #define v4l2_async_register_subdev_sensor(sd) \ __v4l2_async_register_subdev_sensor(sd, THIS_MODULE) This ensures the sensor driver module is properly referenced even when the sensor driver does not init the owner field before calling v4l2_async_register_subdev_sensor() and prevents premature module removal.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected aef69d54755d45edefbf347a51efd1673d7daed9 before f35e85a9d919d7954d9a7752e4644c0b403ad025; affected aef69d54755d45edefbf347a51efd1673d7daed9 before c5e47cf9a6cffef73a1ed40b3648e6097aac165a; affected aef69d54755d45edefbf347a51efd1673d7daed9 before 47ef04cd13d38010b580056a9d8840aaab944841; affected aef69d54755d45edefbf347a51efd1673d7daed9 before caea6bc68c925d63ca33d21b2255f47181943d61; affected aef69d54755d45edefbf347a51efd1673d7daed9 before cf9732fd6c4f2f803ccfc46d89489b6635590270; affected aef69d54755d45edefbf347a51efd1673d7daed9 before 067887ff93fddbb3a3fb84c900bc654ecfe5ba61; affected aef69d54755d45edefbf347a51efd1673d7daed9 before 06cb687a5132fcffe624c0070576ab852ac6b568 |
| Linux / Linux | affected 4.15; unaffected 0 before 4.15; unaffected 5.10.266 through 5.10.*; unaffected 5.15.217 through 5.15.*; unaffected 6.6.151 through 6.6.*; unaffected 6.12.101 through 6.12.*; unaffected 6.18.42 through 6.18.*; unaffected 7.1.6 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/f35e85a9d919d7954d9a7752e4644c0b403ad025
- https://git.kernel.org/stable/c/c5e47cf9a6cffef73a1ed40b3648e6097aac165a
- https://git.kernel.org/stable/c/47ef04cd13d38010b580056a9d8840aaab944841
- https://git.kernel.org/stable/c/caea6bc68c925d63ca33d21b2255f47181943d61
- https://git.kernel.org/stable/c/cf9732fd6c4f2f803ccfc46d89489b6635590270
- https://git.kernel.org/stable/c/067887ff93fddbb3a3fb84c900bc654ecfe5ba61
- https://git.kernel.org/stable/c/06cb687a5132fcffe624c0070576ab852ac6b568