bpf: correct use/def for may_goto instruction

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may_goto instruction does not use any registers,
but in compute_insn_live_regs() it was treated as a regular
conditional jump of kind BPF_K with r0 as source register.
Thus unnecessarily marking r0 as used.

Fixes: 14c8552db6 ("bpf: simple DFA-based live registers analysis")
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20250305085436.2731464-1-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Eduard Zingerman 2025-03-05 00:54:36 -08:00 • committed by Alexei Starovoitov

parent c1d95a0f2d

commit 871ef8d50e

2 changed files with 4 additions and 3 deletions

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1

kernel/bpf/verifier.c

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6

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

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