From: Andrii Nakryiko andrii@kernel.org
[ Upstream commit 966a7509325395c51c5f6d89e7352b0585e4804b ]
Fix the bug in bpf_object__relocate_core() which can lead to finding invalid matching BPF program when processing CO-RE relocation. IF matching program is not found, last encountered program will be assumed to be correct program and thus error detection won't detect the problem.
Fixes: 9c82a63cf370 ("libbpf: Fix CO-RE relocs against .text section") Signed-off-by: Andrii Nakryiko andrii@kernel.org Signed-off-by: Alexei Starovoitov ast@kernel.org Link: https://lore.kernel.org/bpf/20220426004511.2691730-4-andrii@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/lib/bpf/libbpf.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c index 9c202bba911c..0ea7b91e675f 100644 --- a/tools/lib/bpf/libbpf.c +++ b/tools/lib/bpf/libbpf.c @@ -5639,9 +5639,10 @@ bpf_object__relocate_core(struct bpf_object *obj, const char *targ_btf_path) */ prog = NULL; for (i = 0; i < obj->nr_programs; i++) { - prog = &obj->programs[i]; - if (strcmp(prog->sec_name, sec_name) == 0) + if (strcmp(obj->programs[i].sec_name, sec_name) == 0) { + prog = &obj->programs[i]; break; + } } if (!prog) { pr_warn("sec '%s': failed to find a BPF program\n", sec_name);