CVE-2023-52492 (GCVE-0-2023-52492)
Vulnerability from cvelistv5
Published
2024-02-29 15:52
Modified
2026-05-11 19:28
Severity ?
4.4 (Medium) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: d2fb0a0438384fee08a418025f743913020033ce
Version: d2fb0a0438384fee08a418025f743913020033ce
Version: d2fb0a0438384fee08a418025f743913020033ce
Version: d2fb0a0438384fee08a418025f743913020033ce
Version: d2fb0a0438384fee08a418025f743913020033ce
Version: d2fb0a0438384fee08a418025f743913020033ce
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