X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=drivers%2Fmd%2Fdm-log.c;h=737961f275c196f9b6aa41957dd08c72457c597b;hb=ac1f0ac22c7be908fd33407273b9808bfaedada4;hp=40ed70df6736754dc378df65ab3c6035c2246f72;hpb=2045e88edb4e0c9ce62d317f77dc59d27d9c530e;p=deliverable%2Flinux.git

diff --git a/drivers/md/dm-log.c b/drivers/md/dm-log.c
index 40ed70df6736..737961f275c1 100644
--- a/drivers/md/dm-log.c
+++ b/drivers/md/dm-log.c
@@ -457,6 +457,14 @@ static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
 		 */
 		buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
 				       bitset_size, ti->limits.hardsect_size);
+
+		if (buf_size > dev->bdev->bd_inode->i_size) {
+			DMWARN("log device %s too small: need %llu bytes",
+				dev->name, (unsigned long long)buf_size);
+			kfree(lc);
+			return -EINVAL;
+		}
+
 		lc->header_location.count = buf_size >> SECTOR_SHIFT;
 
 		lc->io_req.mem.type = DM_IO_VMA;