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tracing/probes: fix error check in parse_btf_field()

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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>
This commit is contained in:
Carlos López 2024-05-27 11:43:52 +02:00 committed by Masami Hiramatsu (Google)
parent 699646734a
commit e569eb3497
1 changed files with 4 additions and 0 deletions
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4
kernel/trace/trace_probe.c
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@ -554,6 +554,10 @@ static int parse_btf_field(char *fieldname, const struct btf_type *type,
anon_offs = 0;
field = btf_find_struct_member(ctx->btf, type, fieldname,
&anon_offs);
if (IS_ERR(field)) {
trace_probe_log_err(ctx->offset, BAD_BTF_TID);
return PTR_ERR(field);
}
if (!field) {
trace_probe_log_err(ctx->offset, NO_BTF_FIELD);
return -ENOENT;