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| author | Xinpeng Liu <danielliu861@gmail.com> | 2019-08-08 02:29:23 +0300 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-08-31 13:51:55 +0300 |
| commit | 19a58ce1dc72264b9d50ff6d86cc36b3c439fb64 (patch) | |
| tree | a36a1cd25575bf6b3307c7dcbbc71fed5019e067 | |
| parent | 595a438c78dbdc43d6c9db4f437267f0bd1548bf (diff) | |
| download | linux-19a58ce1dc72264b9d50ff6d86cc36b3c439fb64.tar.xz | |
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
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>
| -rw-r--r-- | kernel/trace/trace_probe.c | 3 |
1 files changed, 2 insertions, 1 deletions
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); } |