linux-kernel - [PATCH] fgraph: Fix missing unlock in register_ftrace

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241023170448.808512-1-lihuafei1@huawei.com>
Date: Thu, 24 Oct 2024 01:04:48 +0800
From: Li Huafei <lihuafei1@...wei.com>
To: <rostedt@...dmis.org>
CC: <dan.carpenter@...aro.org>, <mhiramat@...nel.org>,
	<linux-kernel@...r.kernel.org>, <linux-trace-kernel@...r.kernel.org>,
	<oe-kbuild@...ts.linux.dev>, <lkp@...el.com>, <lihuafei1@...wei.com>
Subject: [PATCH] fgraph: Fix missing unlock in register_ftrace_graph()

Instead of returning an error, goto the mutex unlock at the end of the
function.

Fixes smatch warning:

kernel/trace/fgraph.c:1317 register_ftrace_graph() warn: inconsistent returns '&ftrace_lock'.

Fixes: 2c02f7375e65 ("fgraph: Use CPU hotplug mechanism to initialize idle shadow stacks")
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/r/202410220121.wxg0olfd-lkp@intel.com/
Signed-off-by: Li Huafei <lihuafei1@...wei.com>
---
 kernel/trace/fgraph.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/fgraph.c b/kernel/trace/fgraph.c
index 41e7a15dcb50..98fa7b2a4903 100644
--- a/kernel/trace/fgraph.c
+++ b/kernel/trace/fgraph.c
@@ -1259,7 +1259,7 @@ int register_ftrace_graph(struct fgraph_ops *gops)
 					fgraph_cpu_init, NULL);
 		if (ret < 0) {
 			pr_warn("fgraph: Error to init cpu hotplug support\n");
-			return ret;
+			goto out;
 		}
 		fgraph_initialized = true;
 		ret = 0;
-- 
2.25.1