linux-kernel - [PATCH] tracing/probe: Fix null pointer dereference

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Message-Id: <1565220563-980-1-git-send-email-danielliu861@gmail.com>
Date:   Thu,  8 Aug 2019 07:29:23 +0800
From:   Xinpeng Liu <danielliu861@...il.com>
To:     rostedt@...dmis.org, mingo@...hat.com
Cc:     linux-kernel@...r.kernel.org, Xinpeng Liu <danielliu861@...il.com>
Subject: [PATCH] tracing/probe: Fix null pointer dereference

BUG: KASAN: null-ptr-deref in trace_probe_cleanup+0x8d/0xd0
Read of size 8 at addr 0000000000000000 by task syz-executor.0/9746
trace_probe_cleanup+0x8d/0xd0
free_trace_kprobe.part.14+0x15/0x50
alloc_trace_kprobe+0x23e/0x250

Signed-off-by: Xinpeng Liu <danielliu861@...il.com>
---
 kernel/trace/trace_probe.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index dbef0d1..fb6bfbc 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -895,7 +895,8 @@ void trace_probe_cleanup(struct trace_probe *tp)
 	for (i = 0; i < tp->nr_args; i++)
 		traceprobe_free_probe_arg(&tp->args[i]);
 
-	kfree(call->class->system);
+	if (call->class)
+		kfree(call->class->system);
 	kfree(call->name);
 	kfree(call->print_fmt);
 }
-- 
1.8.3.1