diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 48dfb8e4baf20276e8ac801ae84eb3a9e8583e4e..56304c400db57eb828730e5b99ed3f378b708331 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2856,8 +2856,10 @@ static long btrfs_fallocate(struct file *file, int mode,
 			}
 			ret = btrfs_qgroup_reserve_data(inode, cur_offset,
 					last_byte - cur_offset);
-			if (ret < 0)
+			if (ret < 0) {
+				free_extent_map(em);
 				break;
+			}
 		} else {
 			/*
 			 * Do not need to reserve unwritten extent for this