CVE-2024-47809

This patch fixes a possible null pointer dereference when this function is called from requestlock() as lkb->lkbresource is not assigned yet, only after validatelockargs() by calling attach_lkb(). Another issue is that a resource name could be a non printable bytearray and we cannot assume to be ASCII coded.

The log functionality is probably never being hit when DLM is used in normal way and no debug logging is enabled. The null pointer dereference can only occur on a new created lkb that does not have the resource assigned yet, it probably never hits the null pointer dereference but we should be sure that other changes might not change this behaviour and we actually can hit the mentioned null pointer dereference.

In this patch we just drop the printout of the resource name, the lkb id is enough to make a possible connection to a resource name if this exists.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47809.json",
    "cna_assigner": "Linux"
}

References

Affected packages

Linux / Kernel

Package

Name: Kernel

Affected ranges

Type: ECOSYSTEM
Events: Introduced

2.6.30

Fixed

6.1.167

Type: ECOSYSTEM
Events: Introduced

6.2.0

Fixed

6.6.66

Type: ECOSYSTEM
Events: Introduced

6.7.0

Fixed

6.12.5

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-47809.json"