tree df70db387a83dbd0f44552d33eb67606c8404667
parent 3d1d9652978ac5a32a0beb4bdf6065ca39440d89
author Dunrong Huang <riegamaths@gmail.com> 1343061740 +0800
committer Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> 1344605291 +0100

vl.c: Exit QEMU early if no machine is found

We check whether the variable machine is NULL or not before accessing
it. If machine is NULL, exit QEMU with an error, this can avoids a
segfault error.

Markus Armbruster <armbru@redhat.com> adds that the segfault can be
reproduced as follows:

  $ qemu-system-xtensa -cpu help

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>