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dump: do not dump non-existent guest memory

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It does not really make sense to dump memory that is not there.

Moreover, that fixes a segmentation fault when calling dump-guest-memory
with no filter for a machine with no memory defined.

New behaviour is:

(qemu) dump-guest-memory /dev/null
dump: no guest memory to dump
(qemu) dump-guest-memory /dev/null 0 4096
dump: no guest memory to dump

Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Tested-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20170913142036.2469-4-lvivier@redhat.com>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Cornelia Huck 2017-09-13 16:20:35 +02:00 committed by Dr. David Alan Gilbert
parent 6dba634097
commit d1e6994abc
1 changed files with 6 additions and 0 deletions
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6
dump.c
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@ -1536,6 +1536,12 @@ static void dump_init(DumpState *s, int fd, bool has_format,
fprintf(stderr, "DUMP: total memory to dump: %lu\n", s->total_size);
#endif
/* it does not make sense to dump non-existent memory */
if (!s->total_size) {
error_setg(errp, "dump: no guest memory to dump");
goto cleanup;
}
s->start = get_start_block(s);
if (s->start == -1) {
error_setg(errp, QERR_INVALID_PARAMETER, "begin");