Description
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.
Product status
384e624bb211b406db40edc900bb51af8bb267d0 (git) before c6813b5610ac53af73edd87a660d23a0511faa47
384e624bb211b406db40edc900bb51af8bb267d0 (git) before 71ee71d7adcba648077997a29a91158d20c40b09
6.0
Any version before 6.0
6.0.8 (semver)
6.1 (original_commit_for_fix)
References
git.kernel.org/...c/c6813b5610ac53af73edd87a660d23a0511faa47
git.kernel.org/...c/71ee71d7adcba648077997a29a91158d20c40b09
