selftests/bpf: ksym_search won't check symbols exists
Currently, ksym_search located at trace_helpers won't check symbols are existing or not. In ksym_search, when symbol is not found, it will return &syms[0](_stext). But when the kernel symbols are not loaded, it will return NULL, which is not a desired action. This commit will add verification logic whether symbols are loaded prior to the symbol search. Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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@ -52,6 +52,10 @@ struct ksym *ksym_search(long key)
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int start = 0, end = sym_cnt;
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int start = 0, end = sym_cnt;
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int result;
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int result;
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/* kallsyms not loaded. return NULL */
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if (sym_cnt <= 0)
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return NULL;
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while (start < end) {
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while (start < end) {
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size_t mid = start + (end - start) / 2;
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size_t mid = start + (end - start) / 2;
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