RDMA/mthca: Use correct sizing on buffers holding page DMA addresses
The buffer that holds the page DMA addresses is sized off umem->nmap.
This can potentially cause out of bound accesses on the PBL array when
iterating the umem DMA-mapped SGL. This is because if umem pages are
combined, umem->nmap can be much lower than the number of system pages
in umem.
Use ib_umem_num_pages() to size this buffer.
Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
diff --git a/drivers/infiniband/hw/mthca/mthca_provider.c b/drivers/infiniband/hw/mthca/mthca_provider.c
index d063d7a..35c3119 100644
--- a/drivers/infiniband/hw/mthca/mthca_provider.c
+++ b/drivers/infiniband/hw/mthca/mthca_provider.c
@@ -914,7 +914,7 @@
goto err;
}
- n = mr->umem->nmap;
+ n = ib_umem_num_pages(mr->umem);
mr->mtt = mthca_alloc_mtt(dev, n);
if (IS_ERR(mr->mtt)) {
