Potential NULL pointer deference inata: sata_rcar

[Yizhuo Zhai]

Hi All:
In function sata_rcar_bmdma_fill_sg, macro for_each_sg uses sg_next(),
which could return NULL as "sg", however, there's no check before
dereferencing it (in sg_dma_address()), which is potentially unsafe.

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Kind Regards,

Yizhuo Zhai

Computer Science, Graduate Student
University of California, Riverside