2025-05-01 14:10:37
Linux
PUBLISHED
In the Linux kernel, the following vulnerability has been resolved: cxl/region: Fix decoder allocation crash When an intermediate ports decoders have been exhausted by existing regions, and creating a new region with the port in question in its 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 didnt 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.