linux-kernel - [Bug] qlogic/qlcnic: Report a potential use after free in qlcnic

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Date:   Mon, 22 Mar 2021 23:19:07 +0800 (GMT+08:00)
From:   lyl2019@...l.ustc.edu.cn
To:     shshaikh@...vell.com, manishc@...vell.com,
        GR-Linux-NIC-Dev@...vell.com, davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [Bug] qlogic/qlcnic: Report a potential use after free in
 qlcnic_probe

Hi,
    my static analyzer tool reported a potential uaf in qlcnic_probe.

The problem file is drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c in
Linux Kernel-5.12-rc2.

In funtion qlcnic_probe around line 2623,  it calls qlcnic_dcb_enable() 
to enable adapter->dcb. But the adapter->dcb could be freed inside
this callee when qlcnic_dcb_attach(dcb) return non-zero. 

Later the adapter->dcb is used by qlcnic_dcb_get_info(adapter->dcb) 
and could cause a use after free.

Thanks for your time.