From: Jason Andryuk Date: Thu, 28 Aug 2025 00:36:01 +0000 (-0400) Subject: xen/events: Cleanup find_virq() return codes X-Git-Tag: v6.12.54~181 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f8b3aabb2530fe192df33a54dd18a6a36398550;p=thirdparty%2Fkernel%2Fstable.git xen/events: Cleanup find_virq() return codes 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 Reviewed-by: Jan Beulich Reviewed-by: Juergen Gross Signed-off-by: Juergen Gross Message-ID: <20250828003604.8949-2-jason.andryuk@amd.com> Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index 81effbd53dc52..454c9e5c1a8f2 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -1324,10 +1324,11 @@ static int find_virq(unsigned int virq, unsigned int cpu, evtchn_port_t *evtchn) { 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); @@ -1337,10 +1338,10 @@ static int find_virq(unsigned int virq, unsigned int cpu, evtchn_port_t *evtchn) continue; if (status.u.virq == virq && status.vcpu == xen_vcpu_nr(cpu)) { *evtchn = port; - break; + return 0; } } - return rc; + return -ENOENT; } /**