PM: Fix oops in suspend/hibernate code related to failing ioremap()

When ioremap() fails (which might happen for some reason), we nicely
oops in suspend_nvs_save() due to NULL dereference by memcpy() in there.
Fail gracefully instead.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/kernel/power/nvs.c b/kernel/power/nvs.c
index 1836db60bbb6..57c6fabbb6b6 100644
--- a/kernel/power/nvs.c
+++ b/kernel/power/nvs.c
@@ -105,7 +105,7 @@ int suspend_nvs_alloc(void)
 /**
  *      suspend_nvs_save - save NVS memory regions
  */
-void suspend_nvs_save(void)
+int suspend_nvs_save(void)
 {
         struct nvs_page *entry;
 
@@ -114,8 +114,14 @@ void suspend_nvs_save(void)
         list_for_each_entry(entry, &nvs_list, node)
                 if (entry->data) {
                         entry->kaddr = ioremap(entry->phys_start, entry->size);
+                        if (!entry->kaddr) {
+                                suspend_nvs_free();
+                                return -ENOMEM;
+                        }
                         memcpy(entry->data, entry->kaddr, entry->size);
                 }
+
+        return 0;
 }
 
 /**