linux-kernel - Re: [syzbot] [syzbot] [btrfs?] general protection fault in btrfs_root

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Message-ID: <0000000000009572060621414e96@google.com>
Date: Tue, 03 Sep 2024 18:43:55 -0700
From: syzbot <syzbot+9c3e0cdfbfe351b0bc0e@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [syzbot] [btrfs?] general protection fault in btrfs_root_node

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Subject: [syzbot] [btrfs?] general protection fault in btrfs_root_node
Author: ghanshyam1898@...il.com

Added a check for the nullability of the extent_root variable.

I am not sure what error code I should return when the variable is
null. Can someone help me with this? Thank you very much.

#syz test

diff --git a/fs/btrfs/ref-verify.c b/fs/btrfs/ref-verify.c
index 9522a8b79d22..e613420cb079 100644
--- a/fs/btrfs/ref-verify.c
+++ b/fs/btrfs/ref-verify.c
@@ -1002,6 +1002,9 @@ int btrfs_build_ref_tree(struct btrfs_fs_info *fs_info)
  return -ENOMEM;
  extent_root = btrfs_extent_root(fs_info, 0);
+ if (!extent_root)
+ return -EBADF;
+
  eb = btrfs_read_lock_root_node(extent_root);
  level = btrfs_header_level(eb);
  path->nodes[level] = eb;