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qemuMonitorJSONQueryFdsets: Ensure that JSON arrays are valid before using them

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The code didn't check that the reply value is an array and that the
'fds' array is present. This could lead to a crash if qemu wouldn't
return an array in those places.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Jonathon Jongsma <jjongsma@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Peter Krempa 2022-05-06 12:55:00 +02:00
parent 4e64cded66
commit 76709d4f48
1 changed files with 16 additions and 15 deletions
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31
src/qemu/qemu_monitor_json.c
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@ -3685,23 +3685,24 @@ qemuMonitorJSONQueryFdsetsParse(virJSONValue *msg,
}
fdarray = virJSONValueObjectGetArray(entry, "fds");
fdsetinfo->nfds = virJSONValueArraySize(fdarray);
if (fdsetinfo->nfds > 0)
fdsetinfo->fds = g_new0(qemuMonitorFdsetFdInfo, fdsetinfo->nfds);
if ((fdarray = virJSONValueObjectGetArray(entry, "fds"))) {
fdsetinfo->nfds = virJSONValueArraySize(fdarray);
if (fdsetinfo->nfds > 0)
fdsetinfo->fds = g_new0(qemuMonitorFdsetFdInfo, fdsetinfo->nfds);
for (j = 0; j < fdsetinfo->nfds; j++) {
qemuMonitorFdsetFdInfo *fdinfo = &fdsetinfo->fds[j];
virJSONValue *fdentry;
for (j = 0; j < fdsetinfo->nfds; j++) {
qemuMonitorFdsetFdInfo *fdinfo = &fdsetinfo->fds[j];
virJSONValue *fdentry;
if (!(fdentry = virJSONValueArrayGet(fdarray, j))) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("query-fdsets return data missing fd array element"));
return -1;
if (!(fdentry = virJSONValueArrayGet(fdarray, j))) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("query-fdsets return data missing fd array element"));
return -1;
}
/* opaque is optional and may be missing */
fdinfo->opaque = g_strdup(virJSONValueObjectGetString(fdentry, "opaque"));
}
/* opaque is optional and may be missing */
fdinfo->opaque = g_strdup(virJSONValueObjectGetString(fdentry, "opaque"));
}
}
@ -3723,7 +3724,7 @@ int qemuMonitorJSONQueryFdsets(qemuMonitor *mon,
if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
return -1;
if (qemuMonitorJSONCheckError(cmd, reply) < 0)
if (qemuMonitorJSONCheckReply(cmd, reply, VIR_JSON_TYPE_ARRAY) < 0)
return -1;
if (qemuMonitorJSONQueryFdsetsParse(reply, fdsets) < 0)