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rDYBad0BRbz5pTsBWhqkFLhxrEb7qbnHGj+wqB6vFpKRR+UkPvM+0zFZTLsmmgV/PdUyS8qjVay rj3N6v6rEEStlRa9eY0CRSfRKQoFiqo2fHgLiCycEfBpBdUIl49x X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTE1MDMwNCBTYWx0ZWRfX3krLPPV8aYsD 6u3+pc/HsoQyxt+MWexqeAIFHRg/xjAWOZMmN9zfVnRm9zBxz4MtpB3bhXVe1ZB4JGzo8kr1Dul HsbNdppVBE3W+7WoF3ijJQZKaV2H8JZkXtwRsF4/jKXNTDXfPRmGlbngZm1WxUpeu25wmZ06ITb qj4D2gXkfH1zYYSogKxUvoY252dPJc8iT6XDYJ4p8t6//bQhhv+8vo7QsMvJo67Q7l1dAXSVkLM 4zrvE+KF+EGYoKYeiiS5FGHvkmxS06UqvxnpStUaDUu3HMMr8KQaIbu+VmPF+pyyo00rmlCluQC iUtLmUFHrWQvFPVDmk8JbLqwkvgwCg2uIzzNp2b6o3DNZMReoYTkwhRJnzxoDD56KOWS/O/KnVV 2mxXlcuIvjQ61zb2fRbx9Qbp742VZAJzIZv82XVv2bL1IlUX7jquhKxMYiBRbv62YyCGo2E4MnU cCN7vAaLKmYJhl2tAlXeQIrgeiqrQXR1S0TbY+SE= X-Proofpoint-GUID: _frijOjrJNEdePyA6VJmUyW8L3vyI7T3 X-Authority-Analysis: v=2.4 cv=GIadgeNK c=1 sm=1 tr=0 ts=6aa9af96 b=1 cx=c_pps a=qoll8+KPOyaMroiJ2sR5sw==:117 a=qoll8+KPOyaMroiJ2sR5sw==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22 a=RD47p0oAkeU5bO7t-o6f:22 a=RpNjiQI2AAAA:8 a=i0EeH86SAAAA:8 a=CMHY_B2GFhfEp2JUpisA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=5yU3S35YU4bGjq-dph-N:22 a=Bho9c0fBagfJEIQBS7DQ:22 cc=ntf awl=host:12108 X-Proofpoint-ORIG-GUID: _frijOjrJNEdePyA6VJmUyW8L3vyI7T3 On 8/21/26 4:24 AM, Ye Bin wrote: > From: Ye Bin iscsi_conn_error_even= t() queues conn-=20 > >cleanup_work without taking a reference to the connection. If the conne= ction's=20 > refcount drops to zero while the work is still pending or running,=20 > iscsi_conn_release() >=20 >=20 > From: Ye Bin >=20 > iscsi_conn_error_event() queues conn->cleanup_work without taking a > reference to the connection. If the connection's refcount drops to zero > while the work is still pending or running, iscsi_conn_release() frees > the connection memory without canceling the work, leading to a > use-after-free when iscsi_cleanup_conn_work_fn() later dereferences the > freed conn struct. >=20 > This can happen when a session is torn down via iscsi_remove_session(), > which calls iscsi_iter_destroy_conn_fn() to remove and drop the final > reference on each remaining connection. Unlike iscsi_if_destroy_conn() > (which flushes the work) and iscsi_if_stop_conn() (which cancels or > flushes the work), the iscsi_iter_destroy_conn_fn() path does not handle > the pending cleanup_work before dropping the connection reference. >=20 > Trigger flow: >=20 > CPU 0 (error path) CPU 1 (session teardown) > ----------------------- -------------------------- > iscsi_conn_error_event(conn) > queue_work(cleanup_work) > [no conn reference taken] iscsi_remove_session() > iscsi_iter_destroy_conn_fn() > iscsi_remove_conn(conn) > iscsi_put_conn(conn) > refcount =3D=3D 0 > iscsi_conn_release() > kfree(conn) >=20 It's not supported to run iscsi_remove_session while there's running connections. That code was just meant for a qla4xxx mode where it doesn't expose connections so the conn was just used to export info to userspace via sysfs. It's for when the driver uses qla4xxx_sess_conn_setup to create sessions and conns in one call. There's not real use for it so I think fix qla4xxx to remove it's conn firs, then check for session->leadconn !=3D NULL in libiscsi:iscsi_session_remove(). In scsi_transport_iscsi:iscsi_remove_session you could add a BUG then since it should never be done.