netdev - [BUG] net: ethernet: lpc_eth: possible uninitialized-variable access in lpc_eth_drv

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Date:   Sat, 31 Jul 2021 14:34:09 +0800
From:   Li Tuo <islituo@...il.com>
To:     vz@...ia.com, davem@...emloft.net, kuba@...nel.org
Cc:     linux-arm-kernel@...ts.infradead.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, baijiaju1990@...il.com
Subject: [BUG] net: ethernet: lpc_eth: possible uninitialized-variable access
 in lpc_eth_drv_probe()

Hello,

Our static analysis tool finds a possible uninitialized-variable access 
in the nxp driver in Linux 5.14.0-rc3:

At the beginning of the function lpc_eth_drv_probe(), the variable 
dma_handle is not initialized.
If the following conditions are false, it remains uninitialized.
1304:    if (use_iram_for_net(dev))
1314:    if (pldat->dma_buff_base_v == NULL)

However, it is accessed through:
1333:    pldat->dma_buff_base_p = dma_handle;;

I am not quite sure whether this possible uninitialized-variable access 
is real and how to fix it if it is real.
Any feedback would be appreciated, thanks!

Reported-by: TOTE Robot <oslab@...nghua.edu.cn>

Best wishes,
Tuo Li