CVE-2022-48823

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

scsi: qedf: Fix refcount issue when LOGO is received during TMF

Hung task call trace was seen during LOGO processing.

[ 974.309060] [0000:00:00.0]:[qedf_eh_device_reset:868]: 1:0:2:0: LUN RESET Issued… [ 974.309065] [0000:00:00.0]:[qedf_initiate_tmf:2422]: tm_flags 0x10 sc_cmd 00000000c16b930f op = 0x2a target_id = 0x2 lun=0 [ 974.309178] [0000:00:00.0]:[qedf_initiate_tmf:2431]: portid=016900 tm_flags =LUN RESET [ 974.309222] [0000:00:00.0]:[qedf_initiate_tmf:2438]: orig io_req = 00000000ec78df8f xid = 0x180 ref_cnt = 1. [ 974.309625] host1: rport 016900: Received LOGO request while in state Ready [ 974.309627] host1: rport 016900: Delete port [ 974.309642] host1: rport 016900: work event 3 [ 974.309644] host1: rport 016900: lld callback ev 3 [ 974.313243] [0000:61:00.2]:[qedf_execute_tmf:2383]:1: fcport is uploading, not executing flush. [ 974.313295] [0000:61:00.2]:[qedf_execute_tmf:2400]:1: task mgmt command success… [ 984.031088] INFO: task jbd2/dm-15-8:7645 blocked for more than 120 seconds. [ 984.031136] Not tainted 4.18.0-305.el8.x86_64 #1

[ 984.031166] echo 0 > /proc/sys/kernel/hung_task_timeout_secs disables this message. [ 984.031209] jbd2/dm-15-8 D 0 7645 2 0x80004080 [ 984.031212] Call Trace: [ 984.031222] __schedule+0x2c4/0x700 [ 984.031230] ? unfreeze_partials.isra.83+0x16e/0x1a0 [ 984.031233] ? bit_wait_timeout+0x90/0x90 [ 984.031235] schedule+0x38/0xa0 [ 984.031238] io_schedule+0x12/0x40 [ 984.031240] bit_wait_io+0xd/0x50 [ 984.031243] __wait_on_bit+0x6c/0x80 [ 984.031248] ? free_buffer_head+0x21/0x50 [ 984.031251] out_of_line_wait_on_bit+0x91/0xb0 [ 984.031257] ? init_wait_var_entry+0x50/0x50 [ 984.031268] jbd2_journal_commit_transaction+0x112e/0x19f0 [jbd2] [ 984.031280] kjournald2+0xbd/0x270 [jbd2] [ 984.031284] ? finish_wait+0x80/0x80 [ 984.031291] ? commit_timeout+0x10/0x10 [jbd2] [ 984.031294] kthread+0x116/0x130 [ 984.031300] ? kthread_flush_work_fn+0x10/0x10 [ 984.031305] ret_from_fork+0x1f/0x40

There was a ref count issue when LOGO is received during TMF. This leads to one of the I/Os hanging with the driver. Fix the ref count.

Affected Software

References

• https://git.kernel.org/stable/c/5239ab63f17cee643bd4bf6addfedebaa7d4f41e
• https://git.kernel.org/stable/c/6be8eaad75ca73131e2a697f0270dc8ee73814a8
• https://git.kernel.org/stable/c/7cc32ff0cd6c44a3c26de5faecfe8b5546198fad
• https://git.kernel.org/stable/c/7fcbed38503bb34c6e6538b6a9482d1c6bead1e8
• https://git.kernel.org/stable/c/87f187e5265bc8e3b38faef8b9db864cdd61dde7