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parisc: Fix sglist access in ccio-dma.c 

This patch implements the same bug fix to ccio-dma.c as to sba_iommu.c.
It ensures that only the allocated entries of the sglist are accessed.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
John David Anglin 2022-01-27 22:33:41 +00:00 committed by Helge Deller
parent b7d6f44a0f
commit d7da660cab
1 changed files with 2 additions and 1 deletions
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drivers/parisc/ccio-dma.c
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@ -1003,7 +1003,7 @@ ccio_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
ioc->usg_calls++;
#endif
while(sg_dma_len(sglist) && nents--) {
while (nents && sg_dma_len(sglist)) {
#ifdef CCIO_COLLECT_STATS
ioc->usg_pages += sg_dma_len(sglist) >> PAGE_SHIFT;
@ -1011,6 +1011,7 @@ ccio_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
ccio_unmap_page(dev, sg_dma_address(sglist),
sg_dma_len(sglist), direction, 0);
++sglist;
nents--;
}
DBG_RUN_SG("%s() DONE (nents %d)\n", __func__, nents);