scsi: target: iscsi: Fix timeout on deleted connection

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Fix timeout on deleted connection NOPIN response timer may expire on a deleted connection and crash with such logs: Did not receive response to NOPIN on CID: 0, failing connection for I_T Nexus (null),i,0x00023d000125,iqn.2017-01.com.iscsi.target,t,0x3d BUG: Kernel NULL pointer dereference on read at 0x00000000 NIP strlcpy+0x8/0xb0 LR iscsit_fill_cxn_timeout_err_stats+0x5c/0xc0 [iscsi_target_mod] Call Trace: iscsit_handle_nopin_response_timeout+0xfc/0x120 [iscsi_target_mod] call_timer_fn+0x58/0x1f0 run_timer_softirq+0x740/0x860 __do_softirq+0x16c/0x420 irq_exit+0x188/0x1c0 timer_interrupt+0x184/0x410 That is because nopin response timer may be re-started on nopin timer expiration. Stop nopin timer before stopping the nopin response timer to be sure that no one of them will be re-started.

References

• https://git.kernel.org/stable/c/571ce6b6f5cbaf7d24af03cad592fc0e2a54de35
• https://git.kernel.org/stable/c/2c5081439c7ab8da08427befe427f0d732ebc9f9
• https://git.kernel.org/stable/c/019ca2804f3fb49a7f8e56ea6aeaa1ff32724c27
• https://git.kernel.org/stable/c/6815846e0c3a62116a7da9740e3a7c10edc5c7e9
• https://git.kernel.org/stable/c/fe8421e853ef289e1324fcda004751c89dd9c18a
• https://git.kernel.org/stable/c/87389bff743c55b6b85282de91109391f43e0814
• https://git.kernel.org/stable/c/3e6429e3707943078240a2c0c0b3ee99ea9b0d9c
• https://git.kernel.org/stable/c/7f533cc5ee4c4436cee51dc58e81dfd9c3384418