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authorEric Auger <eric.auger@redhat.com>2019-07-22 19:51:49 +0300
committerChristoph Hellwig <hch@lst.de>2019-07-23 18:43:58 +0300
commit06532750010e06dd4b6d69983773677df7fc5291 (patch)
tree1405f8086f5465615024e5447062ead12f80ae7e /include/linux/dma-mapping.h
parent7b5cf701ea9c395c792e2a7e3b7caf4c68b87721 (diff)
downloadlinux-06532750010e06dd4b6d69983773677df7fc5291.tar.xz
dma-mapping: use dma_get_mask in dma_addressing_limited
We currently have cases where the dma_addressing_limited() gets called with dma_mask unset. This causes a NULL pointer dereference. Use dma_get_mask() accessor to prevent the crash. Fixes: b866455423e0 ("dma-mapping: add a dma_addressing_limited helper") Signed-off-by: Eric Auger <eric.auger@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'include/linux/dma-mapping.h')
-rw-r--r--include/linux/dma-mapping.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index e11b115dd0e4..f7d1eea32c78 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -689,8 +689,8 @@ static inline int dma_coerce_mask_and_coherent(struct device *dev, u64 mask)
*/
static inline bool dma_addressing_limited(struct device *dev)
{
- return min_not_zero(*dev->dma_mask, dev->bus_dma_mask) <
- dma_get_required_mask(dev);
+ return min_not_zero(dma_get_mask(dev), dev->bus_dma_mask) <
+ dma_get_required_mask(dev);
}
#ifdef CONFIG_ARCH_HAS_SETUP_DMA_OPS