[libvirt] [PATCH] nwfilter: Fix sscanf off-by-one error in virNWFilterSnoopLeaseFileLoad

[Erik Skultety]

We allocate 16 bytes for IPv4 address and 55 bytes for interface
key, therefore we should read up to 15/54 bytes and let the last byte
reserved for terminating null byte in sscanf.

https://bugzilla.redhat.com/show_bug.cgi?id=1226400
---
 src/nwfilter/nwfilter_dhcpsnoop.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/nwfilter/nwfilter_dhcpsnoop.c b/src/nwfilter/nwfilter_dhcpsnoop.c
index 6da8983..f331e22 100644
--- a/src/nwfilter/nwfilter_dhcpsnoop.c
+++ b/src/nwfilter/nwfilter_dhcpsnoop.c
@@ -1958,8 +1958,8 @@ virNWFilterSnoopLeaseFileLoad(void)
             break;
         }
         ln++;
-        /* key len 55 = "VMUUID"+'-'+"MAC" */
-        if (sscanf(line, "%u %55s %16s %16s", &ipl.timeout,
+        /* key len 54 = "VMUUID"+'-'+"MAC" */
+        if (sscanf(line, "%u %54s %15s %15s", &ipl.timeout,
                    ifkey, ipstr, srvstr) < 4) {
             virReportError(VIR_ERR_INTERNAL_ERROR,
                            _("virNWFilterSnoopLeaseFileLoad lease file "
-- 
1.9.3