Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: cxl/region: Fix decoder allocation crash When an intermediate port's decoders have been exhausted by existing regions, and creating a new region with the port in question in it's hierarchical path is attempted, cxl_port_attach_region() fails to find a port decoder (as would be expected), and drops into the failure / cleanup path. However, during cleanup of the region reference, a sanity check attempts to dereference the decoder, which in the above case didn't exist. This causes a NULL pointer dereference BUG. To fix this, refactor the decoder allocation and de-allocation into helper routines, and in this 'free' routine, check that the decoder, @cxld, is valid before attempting any operations on it.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 384e624bb211b406db40edc900bb51af8bb267d0 before c6813b5610ac53af73edd87a660d23a0511faa47; affected 384e624bb211b406db40edc900bb51af8bb267d0 before 71ee71d7adcba648077997a29a91158d20c40b09 |
| Linux / Linux | affected 6.0; unaffected 0 before 6.0; unaffected 6.0.8 through 6.0.*; unaffected 6.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c6813b5610ac53af73edd87a660d23a0511faa47
- https://git.kernel.org/stable/c/71ee71d7adcba648077997a29a91158d20c40b09
ADP enrichment
No English description supplied.
No references supplied.