Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
Drivers: hv: Check message and event pages for non-NULL before iounmap()
It might happen that some hyp SynIC pages aren't allocated.
Check for that and only then call iounmap().
Signed-off-by: Roman Kisel <romank@linux.microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Reviewed-by: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
authored by
Roman Kisel
and committed by
Wei Liu
09406f2f
1bb15327
+8
-4
+8
-4
drivers/hv/hv.c
+8
-4
drivers/hv/hv.c
···
371
371
*/
372
372
simp.simp_enabled = 0;
373
373
if (ms_hyperv.paravisor_present || hv_root_partition()) {
374
-
iounmap(hv_cpu->hyp_synic_message_page);
375
-
hv_cpu->hyp_synic_message_page = NULL;
374
+
if (hv_cpu->hyp_synic_message_page) {
375
+
iounmap(hv_cpu->hyp_synic_message_page);
376
+
hv_cpu->hyp_synic_message_page = NULL;
377
+
}
376
378
} else {
377
379
simp.base_simp_gpa = 0;
378
380
}
···
385
383
siefp.siefp_enabled = 0;
386
384
387
385
if (ms_hyperv.paravisor_present || hv_root_partition()) {
388
-
iounmap(hv_cpu->hyp_synic_event_page);
389
-
hv_cpu->hyp_synic_event_page = NULL;
386
+
if (hv_cpu->hyp_synic_event_page) {
387
+
iounmap(hv_cpu->hyp_synic_event_page);
388
+
hv_cpu->hyp_synic_event_page = NULL;
389
+
}
390
390
} else {
391
391
siefp.base_siefp_gpa = 0;
392
392
}