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net: spider_net: Use size_add() in call to struct_size()

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[ Upstream commit 0201409079b975e46cc40e8bdff4bd61329ee10f ]

If, for any reason, the open-coded arithmetic causes a wraparound,
the protection that `struct_size()` adds against potential integer
overflows is defeated. Fix this by hardening call to `struct_size()`
with `size_add()`.

Fixes: 3f1071ec39 ("net: spider_net: Use struct_size() helper")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Gustavo A. R. Silva 2023-09-15 13:25:36 -06:00 committed by Greg Kroah-Hartman
parent 9b8486fdad
commit d44f88b20d
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/toshiba/spider_net.c
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@ -2311,7 +2311,7 @@ spider_net_alloc_card(void)
struct spider_net_card *card;
netdev = alloc_etherdev(struct_size(card, darray,
tx_descriptors + rx_descriptors));
size_add(tx_descriptors, rx_descriptors)));
if (!netdev)
return NULL;