| Message ID | ZQSvsLmJrDsKtLCa@work (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [next] net: spider_net: Use size_add() in call to struct_size() | expand |
On Fri, Sep 15, 2023 at 01:25:36PM -0600, Gustavo A. R. Silva wrote: > 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>
On 9/15/23 14:25, Gustavo A. R. Silva wrote: > 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> > --- > 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 50d7eacfec58..87e67121477c 100644 > --- a/drivers/net/ethernet/toshiba/spider_net.c > +++ b/drivers/net/ethernet/toshiba/spider_net.c > @@ -2332,7 +2332,7 @@ 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; > Looks good to me. Thanks for your fix-up. Signed-off-by: Geoff Levand <geoff@infradead.org>
diff --git a/drivers/net/ethernet/toshiba/spider_net.c b/drivers/net/ethernet/toshiba/spider_net.c index 50d7eacfec58..87e67121477c 100644 --- a/drivers/net/ethernet/toshiba/spider_net.c +++ b/drivers/net/ethernet/toshiba/spider_net.c @@ -2332,7 +2332,7 @@ 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;
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> --- drivers/net/ethernet/toshiba/spider_net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)