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bpf: Handle multiple variable additions into packet pointers in verifier.

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We must accumulate into reg->aux_off rather than use a plain assignment.

Add a test for this situation to test_align.

Reported-by: Alexei Starovoitov <ast@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-05-11 19:30:02 -07:00
commit 6832a333ed
2 changed files with 38 additions and 1 deletions
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kernel/bpf/verifier.c
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@ -1531,7 +1531,7 @@ add_imm:
dst_reg->id = ++env->id_gen;
/* something was added to pkt_ptr, set range to zero */
dst_reg->aux_off = dst_reg->off;
dst_reg->aux_off += dst_reg->off;
dst_reg->off = 0;
dst_reg->range = 0;
if (had_id)