linux-kernel - [PATCH 2/2] tracing: fprobe: Fix to remove recorded module addresses from filter

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Message-ID: <175867359903.600222.10400702167171128567.stgit@devnote2>
Date: Wed, 24 Sep 2025 09:26:39 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Menglong Dong <menglong8.dong@...il.com>,
	Menglong Dong <dongml2@...natelecom.cn>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH 2/2] tracing: fprobe: Fix to remove recorded module addresses from filter

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Even if there is a memory allocation failure in fprobe_addr_list_add(),
there is a partial list of module addresses. So remove the recorded
addresses from filter if exists.
This also removes the redundant ret local variable.

Fixes: a3dc2983ca7b ("tracing: fprobe: Cleanup fprobe hash when module unloading")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
 kernel/trace/fprobe.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c
index 12ec194fdfed..95e43814b85b 100644
--- a/kernel/trace/fprobe.c
+++ b/kernel/trace/fprobe.c
@@ -434,8 +434,9 @@ static int fprobe_addr_list_add(struct fprobe_addr_list *alist, unsigned long ad
 {
 	unsigned long *addrs;
 
-	if (alist->index >= alist->size)
-		return -ENOMEM;
+	/* Previously we failed to expand the list. */
+	if (alist->index == alist->size)
+		return -ENOSPC;
 
 	alist->addrs[alist->index++] = addr;
 	if (alist->index < alist->size)
@@ -497,7 +498,7 @@ static int fprobe_module_callback(struct notifier_block *nb,
 	} while (node == ERR_PTR(-EAGAIN));
 	rhashtable_walk_exit(&iter);
 
-	if (alist.index < alist.size && alist.index > 0)
+	if (alist.index > 0)
 		ftrace_set_filter_ips(&fprobe_graph_ops.ops,
 				      alist.addrs, alist.index, 1, 0);
 	mutex_unlock(&fprobe_mutex);