Re: [PATCH] loop: Fix use-after-free issues

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Tue, 14 Mar 2023 11:21:54 -0700, Bart Van Assche wrote:
> do_req_filebacked() calls blk_mq_complete_request() synchronously or
> asynchronously when using asynchronous I/O unless memory allocation fails.
> Hence, modify loop_handle_cmd() such that it does not dereference 'cmd' nor
> 'rq' after do_req_filebacked() finished unless we are sure that the request
> has not yet been completed. This patch fixes the following kernel crash:
> 
> Unable to handle kernel NULL pointer dereference at virtual address 0000000000000054
> Call trace:
>  css_put.42938+0x1c/0x1ac
>  loop_process_work+0xc8c/0xfd4
>  loop_rootcg_workfn+0x24/0x34
>  process_one_work+0x244/0x558
>  worker_thread+0x400/0x8fc
>  kthread+0x16c/0x1e0
>  ret_from_fork+0x10/0x20
> 
> [...]

Applied, thanks!

[1/1] loop: Fix use-after-free issues
      commit: 9b0cb770f5d7b1ff40bea7ca385438ee94570eec

Best regards,
-- 
Jens Axboe






[Index of Archives]     [Linux RAID]     [Linux SCSI]     [Linux ATA RAID]     [IDE]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Device Mapper]

  Powered by Linux