5.10-stable review patch. If anyone has any objections, please let me know.
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From: Gustavo A. R. Silva gustavoars@kernel.org
[ 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: 3f1071ec39f7 ("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 --- drivers/net/ethernet/toshiba/spider_net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/toshiba/spider_net.c b/drivers/net/ethernet/toshiba/spider_net.c index 5f5b33e6653b2..9d4c49f28d31f 100644 --- a/drivers/net/ethernet/toshiba/spider_net.c +++ b/drivers/net/ethernet/toshiba/spider_net.c @@ -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;