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RDMA/cma: fix null-ptr-deref Read in cma_cleanup 

In cma_init, if cma_configfs_init fails, need to free the
previously memory and return fail, otherwise will trigger
null-ptr-deref Read in cma_cleanup.

cma_cleanup
  cma_configfs_exit
    configfs_unregister_subsystem

Fixes: 045959db65 ("IB/cma: Add configfs for rdma_cm")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Reviewed-by: Parav Pandit <parav@mellanox.com>
Link: https://lore.kernel.org/r/1566188859-103051-1-git-send-email-zhengbin13@huawei.com
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
zhengbin 2019-08-19 12:27:39 +08:00 committed by Doug Ledford
parent 841b07f99a
commit a7bfb93f02
1 changed files with 5 additions and 1 deletions
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6
drivers/infiniband/core/cma.c
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@ -4724,10 +4724,14 @@ static int __init cma_init(void)
if (ret)
goto err;
cma_configfs_init();
ret = cma_configfs_init();
if (ret)
goto err_ib;
return 0;
err_ib:
ib_unregister_client(&cma_client);
err:
unregister_netdevice_notifier(&cma_nb);
ib_sa_unregister_client(&sa_client);