Re: [PATCH bpf 0/2] bpf fix for mixed tail calls and subprograms

On 6/8/21 12:29 PM, John Fastabend wrote:

We recently tried to use mixed programs that have both tail calls and
subprograms, but it needs the attached fix. Also added a small test
addition that will cause the failure without the fix.

Thanks,
John

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John Fastabend (2):
       bpf: Fix null ptr deref with mixed tail calls and subprogs
       bpf: selftest to verify mixing bpf2bpf calls and tailcalls with insn patch


  .../selftests/bpf/progs/tailcall_bpf2bpf4.c     | 17 +++++++++++++++++
  1 file changed, 17 insertions(+)

Don't know what happens. Apparently, the first patch made changes
in kernel/bpf/verifier.c, but it didn't show up in the above.

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