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Diffstat (limited to 'drivers/md/dm-log.c')
-rw-r--r--drivers/md/dm-log.c16
1 files changed, 14 insertions, 2 deletions
diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 691cb9c22b5..40ed70df673 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -360,6 +360,17 @@ static int read_header(struct log_c *log)
return 0;
}
+static int _check_region_size(struct dm_target *ti, uint32_t region_size)
+{
+ if (region_size < 2 || region_size > ti->len)
+ return 0;
+
+ if (!is_power_of_2(region_size))
+ return 0;
+
+ return 1;
+}
+
/*----------------------------------------------------------------
* core log constructor/destructor
*
@@ -395,8 +406,9 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
}
}
- if (sscanf(argv[0], "%u", &region_size) != 1) {
- DMWARN("invalid region size string");
+ if (sscanf(argv[0], "%u", &region_size) != 1 ||
+ !_check_region_size(ti, region_size)) {
+ DMWARN("invalid region size %s", argv[0]);
return -EINVAL;
}