[PATCH] KVM: x86: Fix null pointer dereference in trace_kvm_inj_exception

[Daniel Paziyski]

The trace_kvm_inj_exception tracepoint takes as arguments the exception
vector, whether the exception has an error code (and subsequently, the
error code), and whether it is being reinjected. The error code is
formatted to the trace log as a string using __print_symbolic,
which takes an integer value and an array of structs containing a mask
value and a string. An empty struct is being passed, which makes the
kernel derefence a NULL pointer when the error code is 0. Remove this
stray struct in the invocation of __print_symbolic.

Signed-off-by: Daniel Paziyski <danielpaziyski@xxxxxxxxx>
---
 arch/x86/kvm/trace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/trace.h b/arch/x86/kvm/trace.h
index 0db25bba1..93de876c3 100644
--- a/arch/x86/kvm/trace.h
+++ b/arch/x86/kvm/trace.h
@@ -490,7 +490,7 @@ TRACE_EVENT(kvm_inj_exception,
 	TP_printk("%s%s%s%s%s",
 		  __print_symbolic(__entry->exception, kvm_trace_sym_exc),
 		  !__entry->has_error ? "" : " (",
-		  !__entry->has_error ? "" : __print_symbolic(__entry->error_code, { }),
+		  !__entry->has_error ? "" : __print_symbolic(__entry->error_code),
 		  !__entry->has_error ? "" : ")",
 		  __entry->reinjected ? " [reinjected]" : "")
 );
-- 
2.55.0