From 5f818d676ac455bbc812ffaaf5bf780be5465114 Mon Sep 17 00:00:00 2001 From: Shiraz Saleem Date: Thu, 28 Mar 2019 11:49:44 -0500 Subject: RDMA/cxbg: Use correct sizing on buffers holding page DMA addresses The PBL array that hold the page DMA address 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 array. Cc: Potnuri Bharat Teja Signed-off-by: Shiraz Saleem Signed-off-by: Jason Gunthorpe --- drivers/infiniband/hw/cxgb3/iwch_provider.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/infiniband/hw/cxgb3') diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c index c9a1fb323b5c..21aac6bca06f 100644 --- a/drivers/infiniband/hw/cxgb3/iwch_provider.c +++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c @@ -539,7 +539,7 @@ static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, u64 start, u64 length, shift = PAGE_SHIFT; - n = mhp->umem->nmap; + n = ib_umem_num_pages(mhp->umem); err = iwch_alloc_pbl(mhp, n); if (err) -- cgit v1.2.3-59-g8ed1b