CVE-2026-80555

In the Linux kernel, the following vulnerability has been resolved:

s390/vfio_ccw: Free all memory if cp_init() fails

The routine cp_free() is called to unpin/free any memory once an I/O

is completed successfully, or if cp_prefetch() fails. But if cp_init()

fails, and cp->initialized is not enabled, the same routine cannot be

used to free all the memory.

An attempt to address this exists in ccwchain_handle_ccw(), where a

single call to ccwchain_free() is made for the currently-processed

CCW segment. But this will leak other segments (created as a result

of a Transfer in Channel) that had been allocated as part of the same

channel program.

Address this by performing the cleanup outside of the recursive

ccwchain_handle_ccw()/ccwchain_loop_tic() logic.