Drivers: hv: balloon: don't crash when memory is added in non-sorted order

[cascardo/linux.git] / drivers / hv / hv_balloon.c

diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index b853b4b..43af913 100644 (file)
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -714,7 +714,7 @@ static bool pfn_covered(unsigned long start_pfn, unsigned long pfn_cnt)
                 * If the pfn range we are dealing with is not in the current
                 * "hot add block", move on.
                 */
-               if ((start_pfn >= has->end_pfn))
+               if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn)
                        continue;
                /*
                 * If the current hot add-request extends beyond
@@ -768,7 +768,7 @@ static unsigned long handle_pg_range(unsigned long pg_start,
                 * If the pfn range we are dealing with is not in the current
                 * "hot add block", move on.
                 */
-               if ((start_pfn >= has->end_pfn))
+               if (start_pfn < has->start_pfn || start_pfn >= has->end_pfn)
                        continue;
 
                old_covered_state = has->covered_end_pfn;