From: Chunyu Hu <chuhu@redhat.com>
To: rostedt@goodmis.org
Cc: mingo@redhat.com, dan.carpenter@oracle.com,
linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH] tracing: fix a potential mutex deadlock in register_tracer
Date: Mon, 14 Mar 2016 20:35:41 +0800 [thread overview]
Message-ID: <1457958941-30265-1-git-send-email-chuhu@redhat.com> (raw)
commit d39cdd2036a63eef17a14efbd969405ca5612886 ("tracing: Make
tracer_flags use the right set_flag callback") introduces a potential
mutex deadlock issue, as it forgets to free the mutex when allocaing
the tracer_flags gets fail. This patch fix the issue. The issue was
found by Dan Carpenter through Smatch static code check tool.
Signed-off-by: Chunyu Hu <chuhu@redhat.com>
---
kernel/trace/trace.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index b401a18..0ae4604 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1256,8 +1256,10 @@ int __init register_tracer(struct tracer *type)
if (!type->flags) {
/*allocate a dummy tracer_flags*/
type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL);
- if (!type->flags)
- return -ENOMEM;
+ if (!type->flags) {
+ ret = -ENOMEM;
+ goto out;
+ }
type->flags->val = 0;
type->flags->opts = dummy_tracer_opt;
} else
--
1.8.3.1
reply other threads:[~2016-03-14 12:35 UTC|newest]
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