On Mon, May 31, 2021 at 12:26:01PM +0300, Nikolay Borisov wrote:

Syzbot managed to trigger this assert while performing its fuzzing.
Turns out it's better to have those asserts turned into full-fledged
checks so that in case buggy btrfs images are mounted the users gets
an error and mounting is stopped. Alternatively with CONFIG_BTRFS_ASSERT
disabled such image would have been erroneously allowed to be mounted.

Reported-by: syzbot+a6bf271c02e4fe66b4e4@syzkaller.appspotmail.com
Signed-off-by: Nikolay Borisov <redacted>

Added to misc-next, thanks.