This is a note to let you know that I've just added the patch titled
net: spider_net: Use size_add() in call to struct_size()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-spider_net-use-size_add-in-call-to-struct_size.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1ca0aec53a08a60c3e3ca6a765be0f22ab5ead4b
Author: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Date: Fri Sep 15 13:25:36 2023 -0600
net: spider_net: Use size_add() in call to struct_size()
[ 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@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Geoff Levand <geoff@xxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;
