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Date: Thu, 18 Nov 2021 12:21:26 -0800 From: Kees Cook <keescook@...omium.org> To: Doug Ledford <dledford@...hat.com> Cc: Kees Cook <keescook@...omium.org>, Jason Gunthorpe <jgg@...pe.ca>, Max Gurtovoy <maxg@...lanox.com>, linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org, linux-hardening@...r.kernel.org Subject: [PATCH] IB/mthca: Use memset_startat() for clearing mpt_entry In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Use memset_startat() so memset() doesn't get confused about writing beyond the destination member that is intended to be the starting point of zeroing through the end of the struct. Signed-off-by: Kees Cook <keescook@...omium.org> --- drivers/infiniband/hw/mthca/mthca_mr.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/infiniband/hw/mthca/mthca_mr.c b/drivers/infiniband/hw/mthca/mthca_mr.c index ce0e0867e488..1208e92ca3d3 100644 --- a/drivers/infiniband/hw/mthca/mthca_mr.c +++ b/drivers/infiniband/hw/mthca/mthca_mr.c @@ -469,8 +469,7 @@ int mthca_mr_alloc(struct mthca_dev *dev, u32 pd, int buffer_size_shift, mpt_entry->start = cpu_to_be64(iova); mpt_entry->length = cpu_to_be64(total_size); - memset(&mpt_entry->lkey, 0, - sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey)); + memset_startat(mpt_entry, 0, lkey); if (mr->mtt) mpt_entry->mtt_seg = -- 2.30.2
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