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authorWenchao Hao <haowenchao@huawei.com>2022-03-10 02:57:59 +0100
committerMartin K. Petersen <martin.petersen@oracle.com>2022-03-15 05:20:16 +0100
commit8709c323091be019f76a49cf783052a5636aca85 (patch)
treec6b33d2807e849584d32de862a6ca432380444a5 /drivers/scsi/libiscsi.c
parentscsi: libiscsi: Add iscsi_cls_conn to sysfs after initialization (diff)
downloadlinux-8709c323091be019f76a49cf783052a5636aca85.tar.xz
linux-8709c323091be019f76a49cf783052a5636aca85.zip
scsi: libiscsi: Teardown iscsi_cls_conn gracefully
Commit 1b8d0300a3e9 ("scsi: libiscsi: Fix UAF in iscsi_conn_get_param()/iscsi_conn_teardown()") fixed an UAF in iscsi_conn_get_param() and introduced 2 tmp_xxx varibles. We can gracefully fix this UAF with the help of device_del(). Calling iscsi_remove_conn() at the beginning of iscsi_conn_teardown would make userspace unable to see iscsi_cls_conn. This way we we can free memory safely. Remove iscsi_destroy_conn() since it is no longer used. Link: https://lore.kernel.org/r/20220310015759.3296841-4-haowenchao@huawei.com Reviewed-by: Mike Christie <michael.christie@oracle.com> Signed-off-by: Wenchao Hao <haowenchao@huawei.com> Signed-off-by: Wu Bo <wubo40@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/libiscsi.c')
-rw-r--r--drivers/scsi/libiscsi.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 69ddc9f585c5..d09926e6c8a8 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -3107,8 +3107,8 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
{
struct iscsi_conn *conn = cls_conn->dd_data;
struct iscsi_session *session = conn->session;
- char *tmp_persistent_address = conn->persistent_address;
- char *tmp_local_ipaddr = conn->local_ipaddr;
+
+ iscsi_remove_conn(cls_conn);
del_timer_sync(&conn->transport_timer);
@@ -3130,6 +3130,8 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
spin_lock_bh(&session->frwd_lock);
free_pages((unsigned long) conn->data,
get_order(ISCSI_DEF_MAX_RECV_SEG_LEN));
+ kfree(conn->persistent_address);
+ kfree(conn->local_ipaddr);
/* regular RX path uses back_lock */
spin_lock_bh(&session->back_lock);
kfifo_in(&session->cmdpool.queue, (void*)&conn->login_task,
@@ -3140,9 +3142,7 @@ void iscsi_conn_teardown(struct iscsi_cls_conn *cls_conn)
spin_unlock_bh(&session->frwd_lock);
mutex_unlock(&session->eh_mutex);
- iscsi_destroy_conn(cls_conn);
- kfree(tmp_persistent_address);
- kfree(tmp_local_ipaddr);
+ iscsi_put_conn(cls_conn);
}
EXPORT_SYMBOL_GPL(iscsi_conn_teardown);