5.15-stable review patch. If anyone has any objections, please let me know.
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From: Jason Andryuk jason.andryuk@amd.com
commit 08df2d7dd4ab2db8a172d824cda7872d5eca460a upstream.
rc is overwritten by the evtchn_status hypercall in each iteration, so the return value will be whatever the last iteration is. This could incorrectly return success even if the event channel was not found. Change to an explicit -ENOENT for an un-found virq and return 0 on a successful match.
Fixes: 62cc5fc7b2e0 ("xen/pv-on-hvm kexec: rebind virqs to existing eventchannel ports") Cc: stable@vger.kernel.org Signed-off-by: Jason Andryuk jason.andryuk@amd.com Reviewed-by: Jan Beulich jbeulich@suse.com Reviewed-by: Juergen Gross jgross@suse.com Signed-off-by: Juergen Gross jgross@suse.com Message-ID: 20250828003604.8949-2-jason.andryuk@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/xen/events/events_base.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1331,10 +1331,11 @@ static int find_virq(unsigned int virq, { struct evtchn_status status; evtchn_port_t port; - int rc = -ENOENT;
memset(&status, 0, sizeof(status)); for (port = 0; port < xen_evtchn_max_channels(); port++) { + int rc; + status.dom = DOMID_SELF; status.port = port; rc = HYPERVISOR_event_channel_op(EVTCHNOP_status, &status); @@ -1344,10 +1345,10 @@ static int find_virq(unsigned int virq, continue; if (status.u.virq == virq && status.vcpu == xen_vcpu_nr(cpu)) { *evtchn = port; - break; + return 0; } } - return rc; + return -ENOENT; }
/**