s390/dma: do not call debug_dma after free

In dma_free_coherent call debug_dma_free_coherent before deallocating
the memory to avoid a possible use after free.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/include/asm/dma-mapping.h b/arch/s390/include/asm/dma-mapping.h
index 9411db653baca1153c7701046ec2980d5d67b38e..886ac7d4937a85c8cbe25d9ca52fd67d8cd28795 100644 (file)
--- a/arch/s390/include/asm/dma-mapping.h
+++ b/arch/s390/include/asm/dma-mapping.h
@@ -71,8 +71,8 @@ static inline void dma_free_coherent(struct device *dev, size_t size,
 {
        struct dma_map_ops *dma_ops = get_dma_ops(dev);
 
-       dma_ops->free(dev, size, cpu_addr, dma_handle, NULL);
        debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
+       dma_ops->free(dev, size, cpu_addr, dma_handle, NULL);
 }
 
 #endif /* _ASM_S390_DMA_MAPPING_H */