On Wed, Aug 28, 2024 at 07:14:11PM +0300, Fedor Pchelkin wrote:
The local extent changeset is passed to clear_record_extent_bits() where it may have some additional memory dynamically allocated for ulist. When qgroup is disabled, the memory is leaked because in this case the changeset is not released upon __btrfs_qgroup_release_data() return.
Since the recorded contents of the changeset are not used thereafter, just don't pass it.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Reported-by: syzbot+81670362c283f3dd889c@syzkaller.appspotmail.com Closes: https://lore.kernel.org/lkml/000000000000aa8c0c060ade165e@google.com Fixes: af0e2aab3b70 ("btrfs: qgroup: flush reservations during quota disable") Cc: stable@vger.kernel.org # 6.10+ Signed-off-by: Fedor Pchelkin pchelkin@ispras.ru
v2: rework the fix as Qu Wenruo suggested - just don't pass unneeded changeset. Update the commit title and description accordingly.
Thanks, added to for-next.