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a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=BqU2WV_vvsyTyxaotp0D:22 a=SRrdq9N9AAAA:8 a=yPCof4ZbAAAA:8 a=zonR_yTqebhCNNf90iAA:9 a=QEXdDO2ut3YA:10 cc=ntf awl=host:12310 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDI4MDIzMCBTYWx0ZWRfX3wJ6HqQ/Dznz exgJpjRUNUM8NqWErIPPf5zaww4braV8pCLMhk5L6dvJvGlIVVSlfWcshDJlp3yscLKj8fasg4/ sHQomPvckTmeWIu9Baytjh2nK+AAqvWSonjNU1HexDl9eYb16RbGEHB1hS7FT6Ot83kr5mHnVfF J0UfAaxTPPnsqMASVDdU3ZaobxydWp45+TPbJYxTUTm1jm6ILaiSECbBaUuYyouZl7f1oU+Pfgh 0pDO7qSYdFz9RGWXvbx0yh0/t3FTLrkCmCTKwqwOebgmAo9kRcOJkc8N3VrWttoeUqgmq3z0Rlp C/eLEbNUb+w8eVL2kG2pYUB87mbTkKIrKt1p9R2RsCCkG4Y5AF3ptcYnqGdbTKpOFmKK4zO3QC0 Pq/VjLHl2j5dWx6FM276IuF/YGP4WrbOKGSXEHCVQ5HDENWtUomfIVBjbCF9+5UdDbP63kYbtbV 0W7zFctzZY2/yUeW84tk0eWMCqkB7zNc4pnbW7Q0= X-Proofpoint-ORIG-GUID: xHQGOFdbITWSKh_8ksOIS-QQxyr62xGN On 4/23/26 8:39 PM, Guixin Liu wrote: > The TCM_LOOP LUN creation process calls device_register() to create the > device, which in turn invokes tcm_loop_driver_probe() registered with > the TCM_LOOP bus to create and register the scsi_host. > However, if the scsi_host memory allocation fails or scsi_add_host() > fails, the device_register() process still returns success. > Subsequently, when the user binds the LUN to a specific backend device, > it accesses the NULL or freed scsi_host. > > Crash Call Trace: > RIP: 0010:scsi_is_host_device+0x7/0x20 > scsi_alloc_target+0x32/0x2c0 > __scsi_add_device+0x41/0xf0 > scsi_add_device+0xd/0x30 > tcm_loop_port_link+0x25/0x50 [tcm_loop] > target_fabric_port_link+0x9c/0xb0 [target_core_mod] > ... > > This issue is fixed by: > 1. Setting the tcm_loop_hba's scsi_host to NULL, if > scsi_add_host() fails. > 2. Checking the tcm_loop_hba's scsi_host after device_register(). > 3. Checking the tcm_loop_hba's scsi_host in tcm_loop_driver_remove(). > > Fixes: 3703b2c5d041 ("[SCSI] tcm_loop: Add multi-fabric Linux/SCSI LLD fabric module") > Signed-off-by: Guixin Liu Reviewed-by: Mike Christie