From: William Tu <u9012...@gmail.com> Date: Sat, 4 Feb 2017 08:37:29 -0800
> The patch fixes the case when adding a zero value to the packet > pointer. The zero value could come from src_reg equals type > BPF_K or CONST_IMM. The patch fixes both, otherwise the verifer > reports the following error: > [...] > R0=imm0,min_value=0,max_value=0 > R1=pkt(id=0,off=0,r=4) > R2=pkt_end R3=fp-12 > R4=imm4,min_value=4,max_value=4 > R5=pkt(id=0,off=4,r=4) > 269: (bf) r2 = r0 // r2 becomes imm0 > 270: (77) r2 >>= 3 > 271: (bf) r4 = r1 // r4 becomes pkt ptr > 272: (0f) r4 += r2 // r4 += 0 > addition of negative constant to packet pointer is not allowed > > Signed-off-by: William Tu <u9012...@gmail.com> > Signed-off-by: Mihai Budiu <mbu...@vmware.com> > Cc: Daniel Borkmann <dan...@iogearbox.net> > Cc: Alexei Starovoitov <a...@kernel.org> > Acked-by: Daniel Borkmann <dan...@iogearbox.net> Applied, thanks.
