Updated: 2024-11-05 04:44:44.645957
Description:
In the Linux kernel, the following vulnerability has been resolved: dmaengine: fix NULL pointer in channel unregistration function __dma_async_device_channel_register() can fail. In case of failure, chan->local is freed (with free_percpu()), and chan->local is nullified. When dma_async_device_unregister() is called (because of managed API or intentionally by DMA controller driver), channels are unconditionally unregistered, leading to this NULL pointer: [ 1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0 [...] [ 1.484499] Call trace: [ 1.486930] device_del+0x40/0x394 [ 1.490314] device_unregister+0x20/0x7c [ 1.494220] __dma_async_device_channel_unregister+0x68/0xc0 Look at dma_async_device_register() function error path, channel device unregistration is done only if chan->local is not NULL. Then add the same condition at the beginning of __dma_async_device_channel_unregister() function, to avoid NULL pointer issue whatever the API used to reach this function.
| Links | NIST | CIRCL | RHEL | Ubuntu |
| Severity | Score | |
|---|---|---|
| CVSS Version 2.x | NONE | 0 |
| CVSS Version 3.x | MEDIUM | 4.4 |
| OS name | Project name | Version | Score | Severity | Status | Errata | Last updated | Statement |
|---|---|---|---|---|---|---|---|---|
| AlmaLinux 9.2 ESU | kernel | 5.14.0 | 4.4 | MEDIUM | Needs Triage | 2024-11-12 04:34:49 | ||
| AlmaLinux 9.2 FIPS | kernel | 5.14.0 | 4.4 | MEDIUM | Ignored | 2024-11-14 04:34:00 | ||
| CentOS 8.4 ELS | kernel | 4.18.0 | 4.4 | MEDIUM | Needs Triage | 2024-11-05 04:45:29 | ||
| CentOS 8.5 ELS | kernel | 4.18.0 | 4.4 | MEDIUM | Needs Triage | 2024-11-05 04:45:08 | ||
| CentOS Stream 8 ELS | kernel | 4.18.0 | 4.4 | MEDIUM | Needs Triage | 2024-11-05 04:44:45 |