[PATCH bpf RESEND 0/2] Check the remaining info_cnt before repeating btf fields

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From: Hou Tao <houtao1@xxxxxxxxxx>

Hi,

The patch set adds the missed check again info_cnt when flattening the
array of nested struct. The problem was spotted when developing dynptr
key support for hash map. Patch #1 adds the missed check and patch #2
adds three success test cases and one failure test case for the problem.

Comments are always welcome.

Change Log:
v2:
 * patch #1: check info_cnt in btf_repeat_fields()
 * patch #2: use a hard-coded number instead of BTF_FIELDS_MAX, because
             BTF_FIELDS_MAX is not always available in vmlinux.h (e.g.,
	     for llvm 17/18)

v1: https://lore.kernel.org/bpf/20240911110557.2759801-1-houtao@xxxxxxxxxxxxxxx/T/#t

Hou Tao (2):
  bpf: Check the remaining info_cnt before repeating btf fields
  selftests/bpf: Add more test case for field flattening

 kernel/bpf/btf.c                              | 14 +++-
 .../selftests/bpf/prog_tests/cpumask.c        |  1 +
 .../selftests/bpf/progs/cpumask_common.h      |  5 ++
 .../selftests/bpf/progs/cpumask_failure.c     | 35 +++++++++
 .../selftests/bpf/progs/cpumask_success.c     | 78 ++++++++++++++++++-
 5 files changed, 127 insertions(+), 6 deletions(-)

-- 
2.29.2





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