From: Eric Dumazet edumazet@google.com
[ Upstream commit 1d1d63b612801b3f0a39b7d4467cad0abd60e5c8 ]
if (!type) continue; if (type > RTAX_MAX) return -EINVAL; ... metrics[type - 1] = val;
@type being used as an array index, we need to prevent cpu speculation or risk leaking kernel memory content.
Fixes: 6cf9dfd3bd62 ("net: fib: move metrics parsing to a helper") Signed-off-by: Eric Dumazet edumazet@google.com Link: https://lore.kernel.org/r/20230120133040.3623463-1-edumazet@google.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv4/metrics.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/net/ipv4/metrics.c b/net/ipv4/metrics.c index 04311f7067e2..9a6b01d85cd0 100644 --- a/net/ipv4/metrics.c +++ b/net/ipv4/metrics.c @@ -1,4 +1,5 @@ #include <linux/netlink.h> +#include <linux/nospec.h> #include <linux/rtnetlink.h> #include <linux/types.h> #include <net/ip.h> @@ -24,6 +25,7 @@ int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, int fc_mx_len, if (type > RTAX_MAX) return -EINVAL;
+ type = array_index_nospec(type, RTAX_MAX + 1); if (type == RTAX_CC_ALGO) { char tmp[TCP_CA_NAME_MAX];