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libbpf: Fix off-by-one bug in bpf_core_apply_relo() 

[ Upstream commit de5d0dcef602de39070c31c7e56c58249c56ba37 ]

Fix instruction index validity check which has off-by-one error.

Fixes: 3ee4f53355 ("libbpf: Split bpf_core_apply_relo() into bpf_program independent helper.")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20211025224531.1088894-2-andrii@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andrii Nakryiko 2021-10-25 15:45:28 -07:00 committed by Greg Kroah-Hartman
parent af25dbc846
commit b5949ef075
1 changed files with 1 additions and 1 deletions
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tools/lib/bpf/libbpf.c
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@ -5138,7 +5138,7 @@ static int bpf_core_apply_relo(struct bpf_program *prog,
* relocated, so it's enough to just subtract in-section offset * relocated, so it's enough to just subtract in-section offset
*/ */
insn_idx = insn_idx - prog->sec_insn_off; insn_idx = insn_idx - prog->sec_insn_off;
if (insn_idx > prog->insns_cnt) if (insn_idx >= prog->insns_cnt)
return -EINVAL; return -EINVAL;
insn = &prog->insns[insn_idx]; insn = &prog->insns[insn_idx];