From: Eric Auger <eric.auger@redhat.com>
Date: Fri, 18 May 2018 16:48:07 +0000 (+0100)
Subject: hw/arm/smmuv3: Fix Coverity issue in smmuv3_record_event
X-Git-Tag: v3.0.0-rc0~144^2~26
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=24af32e049684827286e24114a066e09d0dcdaaf;p=users%2Fdwmw2%2Fqemu.git

hw/arm/smmuv3: Fix Coverity issue in smmuv3_record_event

Coverity complains about use of uninitialized Evt struct.
The EVT_SET_TYPE and similar setters use deposit32() on fields
in the struct, so they read the uninitialized existing values.
In cases where we don't set all the fields in the event struct
we'll end up leaking random uninitialized data from QEMU's
stack into the guest.

Initializing the struct with "Evt evt = {};" ought to satisfy
Coverity and fix the data leak.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 1526493784-25328-2-git-send-email-eric.auger@redhat.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---

diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index b3026dea20..42dc521c13 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -143,7 +143,7 @@ static MemTxResult smmuv3_write_eventq(SMMUv3State *s, Evt *evt)
 
 void smmuv3_record_event(SMMUv3State *s, SMMUEventInfo *info)
 {
-    Evt evt;
+    Evt evt = {};
     MemTxResult r;
 
     if (!smmuv3_eventq_enabled(s)) {