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hmp: fix "dump-quest-memory" segfault (ppc) 

Running QEMU with
    qemu-system-ppc64 -M none -nographic -m 256
and executing
    dump-guest-memory /dev/null 0 8192
results in segfault

Fix by checking if we have CPU, and exit with
error if there is no CPU:

    (qemu) dump-guest-memory /dev/null
    this feature or command is not currently supported

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20170913142036.2469-2-lvivier@redhat.com>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Laurent Vivier 2017-09-13 16:20:33 +02:00 committed by Dr. David Alan Gilbert
parent 9d81b2d200
commit b1fde1ef51
1 changed files with 9 additions and 2 deletions
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11
target/ppc/arch_dump.c
View File

@ -224,8 +224,15 @@ typedef struct NoteFuncDescStruct NoteFuncDesc;
int cpu_get_dump_info(ArchDumpInfo *info, int cpu_get_dump_info(ArchDumpInfo *info,
const struct GuestPhysBlockList *guest_phys_blocks) const struct GuestPhysBlockList *guest_phys_blocks)
{ {
PowerPCCPU *cpu = POWERPC_CPU(first_cpu); PowerPCCPU *cpu;
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu); PowerPCCPUClass *pcc;
if (first_cpu == NULL) {
return -1;
}
cpu = POWERPC_CPU(first_cpu);
pcc = POWERPC_CPU_GET_CLASS(cpu);
info->d_machine = PPC_ELF_MACHINE; info->d_machine = PPC_ELF_MACHINE;
info->d_class = ELFCLASS; info->d_class = ELFCLASS;