selftests/bpf: Use bpf_dynptr_slice() to read file dynptr in leak test

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use_file_dynptr_slice_after_put_file() reads the dynptr via
bpf_dynptr_data(), which always returns NULL for a read-only file
dynptr, making the example confusing. Switch to bpf_dynptr_slice(), the
correct read API for file dynptrs, and read (rather than write) the slice
since it is read-only. The test still fails as expected.

Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Amery Hung <ameryhung@gmail.com>
Link: https://lore.kernel.org/r/20260605202056.1780352-6-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Amery Hung 2026-06-05 13:20:56 -07:00 • committed by Alexei Starovoitov

parent ac7f6c9da6

commit d83d4f63cb

1 changed files with 4 additions and 4 deletions

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tools/testing/selftests/bpf/progs/file_reader_fail.c

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