net: 802: Use memset_startat() to clear struct fields
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@chromium.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -65,7 +65,7 @@ static int hippi_header(struct sk_buff *skb, struct net_device *dev,
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hip->le.src_addr_type = 2; /* 12 bit SC address */
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memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
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memset(&hip->le.reserved, 0, 16);
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memset_startat(&hip->le, 0, reserved);
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hip->snap.dsap = HIPPI_EXTENDED_SAP;
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hip->snap.ssap = HIPPI_EXTENDED_SAP;
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