Security update for qemu

Open Source Vulnerabilities SUSE-SU-2019:0435-1

This update for qemu fixes the following issues: Security issues fixed: - CVE-2019-6778: Fixed a heap buffer overflow issue in the SLiRP networking implementation (bsc#1123156). - CVE-2018-16872: Fixed a host security vulnerability related to handling symlinks in usb-mtp (bsc#1119493). - CVE-2018-19489: Fixed a denial of service vulnerability in virtfs (bsc#1117275). - CVE-2018-19364: Fixed a use-after-free if the virtfs interface resulting in a denial of service (bsc#1116717). - CVE-2018-18954: Fixed a denial of service vulnerability related to PowerPC PowerNV memory operations (bsc#1114957). Non-security issues fixed: - Improved disk performance for qemu on xen (bsc#1100408). - Fixed xen offline migration (bsc#1079730, bsc#1101982, bsc#1063993). - Fixed pwrite64/pread64/write to return 0 over -1 for a zero length NULL buffer in qemu (bsc#1121600). - Use /bin/bash to echo value into sys fs for ksm control (bsc#1112646). - Return specification exception for unimplemented diag 308 subcodes rather than a hardware error (bsc#1123179).