| From | Kees Cook <> | Subject | [PATCH v2 48/63] IB/mthca: Use memset_startat() for clearing mpt_entry | Date | Tue, 17 Aug 2021 23:05:18 -0700 |
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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.
Cc: Doug Ledford <dledford@redhat.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Max Gurtovoy <maxg@mellanox.com> Cc: linux-rdma@vger.kernel.org Signed-off-by: Kees Cook <keescook@chromium.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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