From 9a53880b9b59f4afa29e8111bf6c21783de6f426 Mon Sep 17 00:00:00 2001
From: Geoffrey McRae <geoff@hostfission.com>
Date: Sat, 11 Nov 2023 13:34:21 +1100
Subject: [PATCH] [common] ivshmem: fix failure to check ioctl for error result

---
 common/src/platform/linux/ivshmem.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/common/src/platform/linux/ivshmem.c b/common/src/platform/linux/ivshmem.c
index ae152e82..2ffd536d 100644
--- a/common/src/platform/linux/ivshmem.c
+++ b/common/src/platform/linux/ivshmem.c
@@ -119,7 +119,7 @@ bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
 {
   DEBUG_ASSERT(dev);
 
-  unsigned int devSize;
+  int devSize;
   int devFd;
   bool hasDMA;
 
@@ -139,6 +139,12 @@ bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
 
     // get the device size
     devSize = ioctl(devFd, KVMFR_DMABUF_GETSIZE, 0);
+    if (devSize < 0)
+    {
+      DEBUG_ERROR("Failed to get the device size");
+      close(devFd);
+      return false;
+    }
     hasDMA = true;
   }
   else