From: John David Anglin dave.anglin@bell.net
commit d7da660cab47183cded65e11b64497d0f56c6edf upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/parisc/ccio-dma.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/parisc/ccio-dma.c +++ b/drivers/parisc/ccio-dma.c @@ -1008,7 +1008,7 @@ ccio_unmap_sg(struct device *dev, struct 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; @@ -1016,6 +1016,7 @@ ccio_unmap_sg(struct device *dev, struct 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);