From ad2855430b1fcbd4566af464120892a32ce7d9f8 Mon Sep 17 00:00:00 2001
From: Alex Williamson <alex.williamson@redhat.com>
Date: Fri, 1 May 2015 18:10:44 +0200
Subject: [PATCH 10/14] vfio-pci: Fix error path sign

Message-id: <20150501180951.31395.33354.stgit@gimli.home>
Patchwork-id: 64973
O-Subject: [RHEL7.2 qemu-kvm PATCH 10/8] vfio-pci: Fix error path sign
Bugzilla: 1210504
RH-Acked-by: Bandan Das <bsd@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>

This is an impossible error path due to the fact that we're reading a
kernel provided, rather than user provided link, which will certainly
always fit in PATH_MAX.  Currently it returns a fixed 26 char path
plus %d group number, which typically maxes out at double digits.
However, the caller of the initfn certainly expects a less-than zero
return value on error, not just a non-zero value.  Therefore we
should correct the sign here.

Reported-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/misc/vfio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index e6f96db..118489c 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -3870,7 +3870,7 @@ static int vfio_initfn(PCIDevice *pdev)
     len = readlink(path, iommu_group_path, sizeof(path));
     if (len <= 0 || len >= sizeof(path)) {
         error_report("vfio: error no iommu_group for device");
-        return len < 0 ? -errno : ENAMETOOLONG;
+        return len < 0 ? -errno : -ENAMETOOLONG;
     }
 
     iommu_group_path[len] = 0;
-- 
1.8.3.1