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tracing/probes: fix error check in parse_btf_field()
btf_find_struct_member() might return NULL or an error via the
ERR_PTR() macro. However, its caller in parse_btf_field() only checks
for the NULL condition. Fix this by using IS_ERR() and returning the
error up the stack.
Link: https://lore.kernel.org/all/20240527094351.15687-1-clopez@suse.de/
Fixes: c440adfbe3
("tracing/probes: Support BTF based data structure field access")
Signed-off-by: Carlos López <clopez@suse.de>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
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@ -554,6 +554,10 @@ static int parse_btf_field(char *fieldname, const struct btf_type *type,
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anon_offs = 0;
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field = btf_find_struct_member(ctx->btf, type, fieldname,
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&anon_offs);
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if (IS_ERR(field)) {
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trace_probe_log_err(ctx->offset, BAD_BTF_TID);
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return PTR_ERR(field);
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}
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if (!field) {
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trace_probe_log_err(ctx->offset, NO_BTF_FIELD);
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return -ENOENT;
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