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net: fix crash when config small gso_max_size/gso_ipv4_max_size
Config a small gso_max_size/gso_ipv4_max_size will lead to an underflow in sk_dst_gso_max_size(), which may trigger a BUG_ON crash, because sk->sk_gso_max_size would be much bigger than device limits. Call Trace: tcp_write_xmit tso_segs = tcp_init_tso_segs(skb, mss_now); tcp_set_skb_tso_segs tcp_skb_pcount_set // skb->len = 524288, mss_now = 8 // u16 tso_segs = 524288/8 = 65535 -> 0 tso_segs = DIV_ROUND_UP(skb->len, mss_now) BUG_ON(!tso_segs) Add check for the minimum value of gso_max_size and gso_ipv4_max_size. Fixes:46e6b992c2
("rtnetlink: allow GSO maximums to be set on device creation") Fixes:9eefedd58a
("net: add gso_ipv4_max_size and gro_ipv4_max_size per device") Signed-off-by: Wang Liang <wangliang74@huawei.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://patch.msgid.link/20241023035213.517386-1-wangliang74@huawei.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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@ -2032,7 +2032,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
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[IFLA_NUM_TX_QUEUES] = { .type = NLA_U32 },
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[IFLA_NUM_RX_QUEUES] = { .type = NLA_U32 },
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[IFLA_GSO_MAX_SEGS] = { .type = NLA_U32 },
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[IFLA_GSO_MAX_SIZE] = { .type = NLA_U32 },
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[IFLA_GSO_MAX_SIZE] = NLA_POLICY_MIN(NLA_U32, MAX_TCP_HEADER + 1),
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[IFLA_PHYS_PORT_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
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[IFLA_CARRIER_CHANGES] = { .type = NLA_U32 }, /* ignored */
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[IFLA_PHYS_SWITCH_ID] = { .type = NLA_BINARY, .len = MAX_PHYS_ITEM_ID_LEN },
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@ -2057,7 +2057,7 @@ static const struct nla_policy ifla_policy[IFLA_MAX+1] = {
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[IFLA_TSO_MAX_SIZE] = { .type = NLA_REJECT },
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[IFLA_TSO_MAX_SEGS] = { .type = NLA_REJECT },
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[IFLA_ALLMULTI] = { .type = NLA_REJECT },
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[IFLA_GSO_IPV4_MAX_SIZE] = { .type = NLA_U32 },
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[IFLA_GSO_IPV4_MAX_SIZE] = NLA_POLICY_MIN(NLA_U32, MAX_TCP_HEADER + 1),
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[IFLA_GRO_IPV4_MAX_SIZE] = { .type = NLA_U32 },
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};
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