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vl.c: validate -numa "cpus" parameter properly

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- Accept empty strings without aborting
- Use parse_uint*() to parse numbers
- Abort if anything except '-' or end-of-string is found after the first
  number.
- Check for endvalue < value

Also change the MAX_CPUMASK_BITS warning message from "A max of %d CPUs
are supported in a guest" to "qemu: NUMA: A max of %d VCPUs are
supported".

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Eduardo Habkost 2013-02-04 16:27:52 -02:00 committed by Anthony Liguori
parent 845e5bf9cd
commit c881e20eed
1 changed files with 29 additions and 7 deletions
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36
vl.c
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@ -1249,21 +1249,43 @@ static void numa_node_parse_cpus(int nodenr, const char *cpus)
char *endptr;
unsigned long long value, endvalue;
value = strtoull(cpus, &endptr, 10);
if (*endptr == '-') {
endvalue = strtoull(endptr+1, &endptr, 10);
} else {
endvalue = value;
/* Empty CPU range strings will be considered valid, they will simply
* not set any bit in the CPU bitmap.
*/
if (!*cpus) {
return;
}
if (!(endvalue < MAX_CPUMASK_BITS)) {
if (parse_uint(cpus, &value, &endptr, 10) < 0) {
goto error;
}
if (*endptr == '-') {
if (parse_uint_full(endptr + 1, &endvalue, 10) < 0) {
goto error;
}
} else if (*endptr == '\0') {
endvalue = value;
} else {
goto error;
}
if (endvalue >= MAX_CPUMASK_BITS) {
endvalue = MAX_CPUMASK_BITS - 1;
fprintf(stderr,
"A max of %d CPUs are supported in a guest\n",
"qemu: NUMA: A max of %d VCPUs are supported\n",
MAX_CPUMASK_BITS);
}
if (endvalue < value) {
goto error;
}
bitmap_set(node_cpumask[nodenr], value, endvalue-value+1);
return;
error:
fprintf(stderr, "qemu: Invalid NUMA CPU range: %s\n", cpus);
exit(1);
}
static void numa_add(const char *optarg)