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vl.c: Fix Coverity complaining for vmstate_dump_file 

commit abfd9ce3(migration: dump vmstate info as a json
file for static analysis) introduce a new command,
'-dump-vmstate', that takes a filename
as an argument.  When executed, QEMU will dump the vmstate information
for the machine type it's invoked with to the file, and quit.

However, only one instance of the -dump-vmstate option is supported.
If more were given, the vmstate_dump_file variable would be overwritten.

This fix also helps silence a Coverity error.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Gonglei 2014-10-29 20:49:43 +08:00 committed by Paolo Bonzini
parent e4dc3f5909
commit 522abf6999
1 changed files with 5 additions and 0 deletions
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vl.c
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@ -3750,6 +3750,11 @@ int main(int argc, char **argv, char **envp)
configure_msg(opts);
break;
case QEMU_OPTION_dump_vmstate:
if (vmstate_dump_file) {
fprintf(stderr, "qemu: only one '-dump-vmstate' "
"option may be given\n");
exit(1);
}
vmstate_dump_file = fopen(optarg, "w");
if (vmstate_dump_file == NULL) {
fprintf(stderr, "open %s: %s\n", optarg, strerror(errno));