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Subject: [PATCH] memory leak in btrfs_read_chunk_tree
Author: hariconscious@gmail.com

#syz test

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index ae1742a35e76..fa912137c94d 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -7188,6 +7188,8 @@ static int read_one_dev(struct extent_buffer *leaf,
                if (!btrfs_test_opt(fs_info, DEGRADED)) {
                        btrfs_report_missing_device(fs_info, devid,
                                                        dev_uuid, true);
+                       //1
+                       free_fs_devices(fs_devices);
                        return -ENOENT;
                }

@@ -7196,6 +7198,8 @@ static int read_one_dev(struct extent_buffer *leaf,
                        btrfs_err(fs_info,
                                "failed to add missing dev %llu: %ld",
                                devid, PTR_ERR(device));
+                       //2
+                       free_fs_devices(fs_devices);
                        return PTR_ERR(device);
                }
                btrfs_report_missing_device(fs_info, devid, dev_uuid,
false);
@@ -7204,6 +7208,8 @@ static int read_one_dev(struct extent_buffer *leaf,
                        if (!btrfs_test_opt(fs_info, DEGRADED)) {
                                btrfs_report_missing_device(fs_info,
                                                devid, dev_uuid, true);
+                               //3
+                               free_fs_devices(fs_devices);
                                return -ENOENT;
                        }
                        btrfs_report_missing_device(fs_info, devid,
@@ -7242,6 +7248,9 @@ static int read_one_dev(struct extent_buffer *leaf,
                BUG_ON(test_bit(BTRFS_DEV_STATE_WRITEABLE,
&device->dev_state));
                if (device->generation !=
                    btrfs_device_generation(leaf, dev_item))
+                       //4
+                       btrfs_free_device(device);
+                       free_fs_devices(fs_devices);
                        return -EINVAL;
        }

@@ -7253,6 +7262,9 @@ static int read_one_dev(struct extent_buffer *leaf,
                        btrfs_err(fs_info,
                        "device total_bytes should be at most %llu but
found %llu",
                                  max_total_bytes, device->total_bytes);
+                       //5
+                       btrfs_free_device(device);
+                       free_fs_devices(fs_devices);
                        return -EINVAL;
                }
        }