[Xen-devel] [PATCH v2] tools/xl: refuse to set number of vcpus to 0 via xl vcpu-set

[Juergen Gross <jgross@xxxxxxxx>]

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@xxxxxxxx>
---
 tools/libxl/libxl_domain.c | 6 ++++++
 tools/xl/xl_vcpu.c         | 5 +++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/libxl/libxl_domain.c b/tools/libxl/libxl_domain.c
index 533bcdf240..3377bba994 100644
--- a/tools/libxl/libxl_domain.c
+++ b/tools/libxl/libxl_domain.c
@@ -1369,6 +1369,12 @@ int libxl_set_vcpuonline(libxl_ctx *ctx, uint32_t domid, 
libxl_bitmap *cpumap)
     }
 
     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!",
diff --git a/tools/xl/xl_vcpu.c b/tools/xl/xl_vcpu.c
index aef486864c..3057c22aae 100644
--- a/tools/xl/xl_vcpu.c
+++ b/tools/xl/xl_vcpu.c
@@ -331,13 +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;
     }
-- 
2.16.4


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