CVE-2022-49195

Source
https://nvd.nist.gov/vuln/detail/CVE-2022-49195
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49195.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2022-49195
Related
Published
2025-02-26T07:00:56Z
Modified
2025-02-26T07:00:56Z
Summary
[none]
Details

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

net: dsa: fix panic on shutdown if multi-chip tree failed to probe

DSA probing is atypical because a tree of devices must probe all at once, so out of N switches which call dsatreesetuproutingtable() during probe, for (N - 1) of them, "complete" will return false and they will exit probing early. The Nth switch will set up the whole tree on their behalf.

The implication is that for (N - 1) switches, the driver binds to the device successfully, without doing anything. When the driver is bound, the ->shutdown() method may run. But if the Nth switch has failed to initialize the tree, there is nothing to do for the (N - 1) driver instances, since the slave devices have not been created, etc. Moreover, dsaswitchshutdown() expects that the calling @ds has been in fact initialized, so it jumps at dereferencing the various data structures, which is incorrect.

Avoid the ensuing NULL pointer dereferences by simply checking whether the Nth switch has previously set "ds->setup = true" for the switch which is currently shutting down. The entire setup is serialized under dsa2_mutex which we already hold.

References

Affected packages

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.17.3-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.17.3-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}