Messages in this thread Patch in this message | | | Date | Sat, 31 Aug 2019 06:53:34 -0400 | From | Steven Rostedt <> | Subject | [for-linus][PATCH 5/7] tracing/probe: Fix null pointer dereference |
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From: Xinpeng Liu <danielliu861@gmail.com>
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
Link: http://lkml.kernel.org/r/1565220563-980-1-git-send-email-danielliu861@gmail.com
Fixes: e3dc9f898ef9c ("tracing/probe: Add trace_event_call accesses APIs") Signed-off-by: Xinpeng Liu <danielliu861@gmail.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org> --- 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 dbef0d135075..fb6bfbc5bf86 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); } -- 2.20.1
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