diff options
| author | Balazs Nemeth <bnemeth@redhat.com> | 2021-03-09 14:31:01 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-17 18:34:28 +0300 |
| commit | 5ea5d57c09f95b577ce1bcaab6a5be3f453a7b39 (patch) | |
| tree | f28129f5eb532072cf5915eecda13e490c709737 /net/mpls | |
| parent | ea3fb2ce5fa794d02135f5c079e05cd6fc3f545d (diff) | |
| download | linux-5ea5d57c09f95b577ce1bcaab6a5be3f453a7b39.tar.xz | |
net: avoid infinite loop in mpls_gso_segment when mpls_hlen == 0
commit d348ede32e99d3a04863e9f9b28d224456118c27 upstream.
A packet with skb_inner_network_header(skb) == skb_network_header(skb)
and ETH_P_MPLS_UC will prevent mpls_gso_segment from pulling any headers
from the packet. Subsequently, the call to skb_mac_gso_segment will
again call mpls_gso_segment with the same packet leading to an infinite
loop. In addition, ensure that the header length is a multiple of four,
which should hold irrespective of the number of stacked labels.
Signed-off-by: Balazs Nemeth <bnemeth@redhat.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/mpls')
| -rw-r--r-- | net/mpls/mpls_gso.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/mpls/mpls_gso.c b/net/mpls/mpls_gso.c index b4da6d8e8632..2129856b5933 100644 --- a/net/mpls/mpls_gso.c +++ b/net/mpls/mpls_gso.c @@ -18,6 +18,7 @@ #include <linux/netdev_features.h> #include <linux/netdevice.h> #include <linux/skbuff.h> +#include <net/mpls.h> static struct sk_buff *mpls_gso_segment(struct sk_buff *skb, netdev_features_t features) @@ -31,6 +32,8 @@ static struct sk_buff *mpls_gso_segment(struct sk_buff *skb, skb_reset_network_header(skb); mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb); + if (unlikely(!mpls_hlen || mpls_hlen % MPLS_HLEN)) + goto out; if (unlikely(!pskb_may_pull(skb, mpls_hlen))) goto out; |