CVE-2023-52492

See a problem?
Please try reporting it to the source first.
Source
https://cve.org/CVERecord?id=CVE-2023-52492
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52492.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2023-52492
Downstream
Related
Published
2024-02-29T15:52:10.499Z
Modified
2026-03-20T12:32:33.145914Z
Severity
  • 4.4 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
dmaengine: fix NULL pointer in channel unregistration function
Details

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: fix NULL pointer in channel unregistration function

__dmaasyncdevicechannelregister() can fail. In case of failure, chan->local is freed (with freepercpu()), and chan->local is nullified. When dmaasyncdeviceunregister() 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] devicedel+0x40/0x394 [ 1.490314] deviceunregister+0x20/0x7c [ 1.494220] __dmaasyncdevicechannelunregister+0x68/0xc0

Look at dmaasyncdevice_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 __dmaasyncdevicechannelunregister() function, to avoid NULL pointer issue whatever the API used to reach this function.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52492.json",
    "cna_assigner": "Linux"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
d2fb0a0438384fee08a418025f743913020033ce
Fixed
9de69732dde4e443c1c7f89acbbed2c45a6a8e17
Fixed
047fce470412ab64cb7345f9ff5d06919078ad79
Fixed
2ab32986a0b9e329eb7f8f04dd57cc127f797c08
Fixed
7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b
Fixed
9263fd2a63487c6d04cbb7b74a48fb12e1e352d0
Fixed
f5c24d94512f1b288262beda4d3dcb9629222fc7

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52492.json"