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bpf: reset id on spilled regs in clear_all_pkt_pointers 

Right now, we don't reset the id of spilled registers in case of
clear_all_pkt_pointers(). Given pkt_pointers are highly likely to
contain an id, do so by reusing __mark_reg_unknown_value().

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2017-06-11 00:50:43 +02:00 committed by David S. Miller
parent 4a2ff55aa4
commit 36e24c0030
1 changed files with 2 additions and 2 deletions
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4
kernel/bpf/verifier.c
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@ -1346,8 +1346,8 @@ static void clear_all_pkt_pointers(struct bpf_verifier_env *env)
if (reg->type != PTR_TO_PACKET &&
reg->type != PTR_TO_PACKET_END)
continue;
reg->type = UNKNOWN_VALUE;
reg->imm = 0;
__mark_reg_unknown_value(state->spilled_regs,
i / BPF_REG_SIZE);
}
}