commit e6965188f84a7883e6a0d3448e86b0cf29b24dfc
Author: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
Date:   Wed Nov 5 11:25:46 2025 -0800

    scsi: target: tcm_loop: Fix segfault in tcm_loop_tpg_address_show()
    
    If the allocation of tl_hba->sh fails in tcm_loop_driver_probe() and we
    attempt to dereference it in tcm_loop_tpg_address_show() we will get a
    segfault, see below for an example. So, check tl_hba->sh before
    dereferencing it.
    
      Unable to allocate struct scsi_host
      BUG: kernel NULL pointer dereference, address: 0000000000000194
      #PF: supervisor read access in kernel mode
      #PF: error_code(0x0000) - not-present page
      PGD 0 P4D 0
      Oops: 0000 [#1] PREEMPT SMP NOPTI
      CPU: 1 PID: 8356 Comm: tokio-runtime-w Not tainted 6.6.104.2-4.azl3 #1
      Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 09/28/2024
      RIP: 0010:tcm_loop_tpg_address_show+0x2e/0x50 [tcm_loop]
    ...
      Call Trace:
       <TASK>
       configfs_read_iter+0x12d/0x1d0 [configfs]
       vfs_read+0x1b5/0x300
       ksys_read+0x6f/0xf0
    ...
    
    Cc: stable@vger.kernel.org
    Fixes: 2628b352c3d4 ("tcm_loop: Show address of tpg in configfs")
    Signed-off-by: Hamza Mahfooz <hamzamahfooz@linux.microsoft.com>
    Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
    Reviewed-by: Allen Pais <apais@linux.microsoft.com>
    Link: https://patch.msgid.link/1762370746-6304-1-git-send-email-hamzamahfooz@linux.microsoft.com
    Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>