Re: [PATCH] ext4: Fix timer use-after-free on failed mount

[Theodore Ts'o]

On Sun, 14 Jul 2024 21:33:36 -0700, Xiaxi Shen wrote:
> Syzbot has found an ODEBUG bug in ext4_fill_super
> 
> The del_timer_sync function cancels the s_err_report timer,
> which reminds about filesystem errors daily. We should
> guarantee the timer is no longer active before kfree(sbi).
> 
> When filesystem mounting fails, the flow goes to failed_mount3,
> where an error occurs when ext4_stop_mmpd is called, causing
> a read I/O failure. This triggers the ext4_handle_error function
> that ultimately re-arms the timer,
> leaving the s_err_report timer active before kfree(sbi) is called.
> 
> [...]

Applied, thanks!

[1/1] ext4: Fix timer use-after-free on failed mount
      commit: 0ce160c5bdb67081a62293028dc85758a8efb22a

Best regards,
-- 
Theodore Ts'o <tytso@xxxxxxx>