CVE-2021-47199

In the Linux kernel, the following vulnerability has been resolved:
net/mlx5e: CT, Fix multiple allocations and memleak of mod acts CT clear
action offload adds additional mod hdr actions to the flow’s original mod
actions in order to clear the registers which hold ct_state. When such flow
also includes encap action, a neigh update event can cause the driver to
unoffload the flow and then reoffload it. Each time this happens, the ct
clear handling adds that same set of mod hdr actions to reset ct_state
until the max of mod hdr actions is reached. Also the driver never releases
the allocated mod hdr actions and causing a memleak. Fix above two issues
by moving CT clear mod acts allocation into the parsing actions phase and
only use it when offloading the rule. The release of mod acts will be done
in the normal flow_put(). backtrace: [<000000007316e2f3>]
krealloc+0x83/0xd0 [<00000000ef157de1>] mlx5e_mod_hdr_alloc+0x147/0x300
[mlx5_core] [<00000000970ce4ae>]
mlx5e_tc_match_to_reg_set_and_get_id+0xd7/0x240 [mlx5_core]
[<0000000067c5fa17>] mlx5e_tc_match_to_reg_set+0xa/0x20 [mlx5_core]
[<00000000d032eb98>] mlx5_tc_ct_entry_set_registers.isra.0+0x36/0xc0
[mlx5_core] [<00000000fd23b869>] mlx5_tc_ct_flow_offload+0x272/0x1f10
[mlx5_core] [<000000004fc24acc>]
mlx5e_tc_offload_fdb_rules.part.0+0x150/0x620 [mlx5_core]
[<00000000dc741c17>] mlx5e_tc_encap_flows_add+0x489/0x690 [mlx5_core]
[<00000000e92e49d7>] mlx5e_rep_update_flows+0x6e4/0x9b0 [mlx5_core]
[<00000000f60f5602>] mlx5e_rep_neigh_update+0x39a/0x5d0 [mlx5_core]