linux-kernel - [PATCH] tracing/probes: fix error check in parse_btf

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Date: Sat, 25 May 2024 20:21:32 +0200
From: Carlos López <clopez@...e.de>
To: linux-trace-kernel@...r.kernel.org
Cc: Carlos López <clopez@...e.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Alan Maguire <alan.maguire@...cle.com>,
	linux-kernel@...r.kernel.org (open list:TRACING)
Subject: [PATCH] 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.

Fixes: c440adfbe3025 ("tracing/probes: Support BTF based data structure field access")
Signed-off-by: Carlos López <clopez@...e.de>
---
 kernel/trace/trace_probe.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 5e263c141574..5417e9712157 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -554,6 +554,8 @@ 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))
+				return PTR_ERR(field);
 			if (!field) {
 				trace_probe_log_err(ctx->offset, NO_BTF_FIELD);
 				return -ENOENT;
-- 
2.35.3