CVE-2021-47554
See a problem?- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47554
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47554.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47554
- Related
- Published
- 2024-05-24T15:15:20Z
- Modified
- 2024-09-18T01:00:21Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
vdpasim: avoid putting an uninitialized iovadomain
The system will crash if we put an uninitialized iovadomain, this could happen when an error occurs before initializing the iovadomain in vdpasim_create().
BUG: kernel NULL pointer dereference, address: 0000000000000000 ... RIP: 0010:_cpuhpstateremoveinstance+0x96/0x1c0 ... Call Trace: <TASK> putiovadomain+0x29/0x220 vdpasimfree+0xd1/0x120 [vdpasim] vdpareleasedev+0x21/0x40 [vdpa] devicerelease+0x33/0x90 kobjectrelease+0x63/0x160 vdpasimcreate+0x127/0x2a0 [vdpasim] vdpasimnetdevadd+0x7d/0xfe [vdpasimnet] vdpanlcmddevaddsetdoit+0xe1/0x1a0 [vdpa] genlfamilyrcvmsgdoit+0x112/0x140 genlrcv_msg+0xdf/0x1d0 ...
So we must make sure the iova_domain is already initialized before put it.
In addition, we may get the following warning in this case: WARNING: ... drivers/iommu/iova.c:344 iovacacheput+0x58/0x70
So we must make sure the iovacacheput() is invoked only if the iovacacheget() is already invoked. Let's fix it together.
- References
Affected packages
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source