bpf: Drop redundant hash_buf from map_get_hash operation

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bpf_map_get_info_by_fd() is the only caller of the ->map_get_hash
and always invokes it with hash_buf == map->sha and hash_buf_size
of SHA256_DIGEST_SIZE. array_map_get_hash() in turn lets sha256()
write the digest directly into that buffer (map->sha) and then
performs a trailing memcpy(), which evaluates to memcpy(map->sha,
map->sha, 32): a redundant self-copy. The hash_buf_size argument
was never used at all. Simplify this a bit, no functional change.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/r/20260601150248.394863-3-daniel@iogearbox.net
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Daniel Borkmann 2026-06-01 17:02:43 +02:00 • committed by Alexei Starovoitov

parent 9a3c3c49c3

commit c48c3a7e7d

3 changed files with 6 additions and 10 deletions

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2

include/linux/bpf.h

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6

kernel/bpf/arraymap.c

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8

kernel/bpf/syscall.c

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