From: Xinpeng Liu <danielliu861@gmail.com>
To: rostedt@goodmis.org, mingo@redhat.com
Cc: linux-kernel@vger.kernel.org, Xinpeng Liu <danielliu861@gmail.com>
Subject: [PATCH] tracing/probe: Fix null pointer dereference
Date: Thu, 8 Aug 2019 07:29:23 +0800 [thread overview]
Message-ID: <1565220563-980-1-git-send-email-danielliu861@gmail.com> (raw)
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@gmail.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
reply other threads:[~2019-08-07 23:29 UTC|newest]
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