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authorXinpeng Liu <danielliu861@gmail.com>2019-08-08 07:29:23 +0800
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2019-08-31 06:51:55 -0400
commit19a58ce1dc72264b9d50ff6d86cc36b3c439fb64 (patch)
treea36a1cd25575bf6b3307c7dcbbc71fed5019e067 /kernel
parent595a438c78dbdc43d6c9db4f437267f0bd1548bf (diff)
downloadlinux-19a58ce1dc72264b9d50ff6d86cc36b3c439fb64.tar.bz2
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_probe.c3
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);
}