CVE-2024-26845

In the Linux kernel, the following vulnerability has been resolved:

scsi: target: core: Add TMF to tmr_list handling

An abort that is responded to by iSCSI itself is added to tmr_list but does

not go to target core. A LUN_RESET that goes through tmr_list takes a

refcounter on the abort and waits for completion. However, the abort will

be never complete because it was not started in target core.

Unable to locate ITT: 0x05000000 on CID: 0

Unable to locate RefTaskTag: 0x05000000 on CID: 0.

wait_for_tasks: Stopping tmf LUN_RESET with tag 0x0 ref_task_tag 0x0 i_state 34 t_state ISTATE_PROCESSING refcnt 2 transport_state active,stop,fabric_stop

wait for tasks: tmf LUN_RESET with tag 0x0 ref_task_tag 0x0 i_state 34 t_state ISTATE_PROCESSING refcnt 2 transport_state active,stop,fabric_stop

...

INFO: task kworker/0:2:49 blocked for more than 491 seconds.

task:kworker/0:2 state:D stack: 0 pid: 49 ppid: 2 flags:0x00000800

Workqueue: events target_tmr_work [target_core_mod]

Call Trace:

__switch_to+0x2c4/0x470

_schedule+0x314/0x1730

schedule+0x64/0x130

schedule_timeout+0x168/0x430

wait_for_completion+0x140/0x270

target_put_cmd_and_wait+0x64/0xb0 [target_core_mod]

core_tmr_lun_reset+0x30/0xa0 [target_core_mod]

target_tmr_work+0xc8/0x1b0 [target_core_mod]

process_one_work+0x2d4/0x5d0

worker_thread+0x78/0x6c0

To fix this, only add abort to tmr_list if it will be handled by target

core.