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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. 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>
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1 changed files with 1 additions and 2 deletions
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@ -467,8 +467,7 @@ int mthca_mr_alloc(struct mthca_dev *dev, u32 pd, int buffer_size_shift,
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mpt_entry->start = cpu_to_be64(iova);
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mpt_entry->length = cpu_to_be64(total_size);
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memset(&mpt_entry->lkey, 0,
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sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));
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memset_startat(mpt_entry, 0, lkey);
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if (mr->mtt)
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mpt_entry->mtt_seg =
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