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s390/pci: fix potential NULL pointer dereference in dma_free_seg_table()
The dereference to 'zdev' should be moved below the NULL test. Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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1 changed files with 2 additions and 1 deletions
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@ -193,12 +193,13 @@ static void dma_free_seg_table(unsigned long entry)
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static void dma_cleanup_tables(struct zpci_dev *zdev)
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{
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unsigned long *table = zdev->dma_table;
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unsigned long *table;
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int rtx;
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if (!zdev || !zdev->dma_table)
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return;
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table = zdev->dma_table;
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for (rtx = 0; rtx < ZPCI_TABLE_ENTRIES; rtx++)
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if (reg_entry_isvalid(table[rtx]))
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dma_free_seg_table(table[rtx]);
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