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IB/mthca: Use memset_startat() for clearing mpt_entry

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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.

Link: https://lore.kernel.org/r/20211213223331.135412-15-keescook@chromium.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Kees Cook 2021-12-13 14:33:28 -08:00 committed by Jason Gunthorpe
parent c2ed5611af
commit 59aa7fcfe2
1 changed files with 1 additions and 2 deletions
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3
drivers/infiniband/hw/mthca/mthca_mr.c
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@ -467,8 +467,7 @@ 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 =