Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Drop handle on protocol bind failures The SCMI bus notifier acquires an SCMI handle when the driver core emits BUS_NOTIFY_BIND_DRIVER, before invoking the protocol driver probe callback. The protocol probe path only checks whether sdev->handle is set. If device_link_add() fails after the handle has been acquired, the protocol device can still bind with a valid handle but without the dependency link to the SCMI parent. A concurrent parent unbind can then miss the child and tear down the SCMI instance while the child still holds a handle into it. If the protocol driver probe later fails, for example with -EPROBE_DEFER, the driver core emits BUS_NOTIFY_DRIVER_NOT_BOUND rather than BUS_NOTIFY_UNBOUND_DRIVER. The SCMI notifier only released the handle on BUS_NOTIFY_UNBOUND_DRIVER, so each failed protocol-device bind leaked the SCMI instance users refcount and left sdev->handle set after the failed probe. Make the link helper report failure and drop the acquired handle if the link cannot be created. Also handle BUS_NOTIFY_DRIVER_NOT_BOUND in the same cleanup path used for unbind so failed probes balance the earlier BUS_NOTIFY_BIND_DRIVER acquisition.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 971fc0665f1361f23251e4d85fac4aed1b683505 before 0f860db24ee95e5da4866303a35e55098b9641b3; affected 971fc0665f1361f23251e4d85fac4aed1b683505 before df273eced7cec550465fd1bb82a5d2c3c7d3c437; affected 971fc0665f1361f23251e4d85fac4aed1b683505 before a54dc23e8bd2246c28eafffa60b4634f0d1a11cc; affected 971fc0665f1361f23251e4d85fac4aed1b683505 before 77d2985d1e80e67f32026fc03e975c4c83cc543d; affected 971fc0665f1361f23251e4d85fac4aed1b683505 before e3a5c30d233ca5d3e799a80da806554c703bda13 |
| Linux / Linux | affected 6.3; unaffected 0 before 6.3; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/0f860db24ee95e5da4866303a35e55098b9641b3
- https://git.kernel.org/stable/c/df273eced7cec550465fd1bb82a5d2c3c7d3c437
- https://git.kernel.org/stable/c/a54dc23e8bd2246c28eafffa60b4634f0d1a11cc
- https://git.kernel.org/stable/c/77d2985d1e80e67f32026fc03e975c4c83cc543d
- https://git.kernel.org/stable/c/e3a5c30d233ca5d3e799a80da806554c703bda13