File 5b8fb5af-tools-xl-refuse-to-set-number-of-vcpus-to-0-via-xl-vcpu-set.patch of Package xen

Subject: tools/xl: refuse to set number of vcpus to 0 via xl vcpu-set
From: Juergen Gross jgross@suse.com Mon Sep 3 14:59:42 2018 +0200
Date: Wed Sep 5 11:53:35 2018 +0100:
Git: 2c0b1824b1cb33a2610f3f55299247f9e0464466

Trying to set the number of vcpus of a domain to 0 isn't refused.
We should not allow that.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>

--- a/tools/libxl/libxl_domain.c
+++ b/tools/libxl/libxl_domain.c
@@ -1337,6 +1337,12 @@ int libxl_set_vcpuonline(libxl_ctx *ctx,
     }
 
     maxcpus = libxl_bitmap_count_set(cpumap);
+    if (maxcpus == 0)
+    {
+        LOGED(ERROR, domid, "Requested 0 VCPUs!");
+        rc = ERROR_FAIL;
+        goto out;
+    }
     if (maxcpus > info.vcpu_max_id + 1)
     {
         LOGED(ERROR, domid, "Requested %d VCPUs, however maxcpus is %d!",
--- a/tools/xl/xl_vcpu.c
+++ b/tools/xl/xl_vcpu.c
@@ -13,6 +13,7 @@
  */
 
 #include <stdlib.h>
+#include <limits.h>
 
 #include <libxl.h>
 #include <libxl_utils.h>
@@ -330,13 +331,14 @@ int main_vcpupin(int argc, char **argv)
 static int vcpuset(uint32_t domid, const char* nr_vcpus, int check_host)
 {
     char *endptr;
-    unsigned int max_vcpus, i;
+    unsigned int i;
+    unsigned long max_vcpus;
     libxl_bitmap cpumap;
     int rc;
 
     libxl_bitmap_init(&cpumap);
     max_vcpus = strtoul(nr_vcpus, &endptr, 10);
-    if (nr_vcpus == endptr) {
+    if (nr_vcpus == endptr || max_vcpus > INT_MAX) {
         fprintf(stderr, "Error: Invalid argument.\n");
         return 1;
     }
@@ -357,7 +359,7 @@ static int vcpuset(uint32_t domid, const
 
         if (max_vcpus > online_vcpus && max_vcpus > host_cpu) {
             fprintf(stderr, "You are overcommmitting! You have %d physical" \
-                    " CPUs and want %d vCPUs! Aborting, use --ignore-host to" \
+                    " CPUs and want %ld vCPUs! Aborting, use --ignore-host to" \
                     " continue\n", host_cpu, max_vcpus);
             return 1;
         }
@@ -374,7 +376,7 @@ static int vcpuset(uint32_t domid, const
     if (rc == ERROR_DOMAIN_NOTFOUND)
         fprintf(stderr, "Domain %u does not exist.\n", domid);
     else if (rc)
-        fprintf(stderr, "libxl_set_vcpuonline failed domid=%u max_vcpus=%d," \
+        fprintf(stderr, "libxl_set_vcpuonline failed domid=%u max_vcpus=%ld," \
                 " rc: %d\n", domid, max_vcpus, rc);
 
     libxl_bitmap_dispose(&cpumap);