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-rw-r--r--drivers/scsi/scsi_debug.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 136329b4027..b02bdc6c2cd 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -1991,7 +1991,8 @@ static void map_region(sector_t lba, unsigned int len)
block = lba + alignment;
rem = do_div(block, granularity);
- set_bit(block, map_storep);
+ if (block < map_size)
+ set_bit(block, map_storep);
lba += granularity - rem;
}
@@ -2011,7 +2012,8 @@ static void unmap_region(sector_t lba, unsigned int len)
block = lba + alignment;
rem = do_div(block, granularity);
- if (rem == 0 && lba + granularity <= end)
+ if (rem == 0 && lba + granularity <= end &&
+ block < map_size)
clear_bit(block, map_storep);
lba += granularity - rem;