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snapshot: require user to supply external memory file name
For disk snapshots, the user could request an external snapshot but not supply a filename; later on, we would check this condition and generate a suitable name if possible, or gracefully error out when not possible (such as when the original file was a block device). But unless we come up with a suitable way to generate external memory file names, we have no later code point that was checking for NULL, so we should forbid this up front. * src/conf/snapshot_conf.c (virDomainSnapshotDefParseString): Avoid NULL deref, since we don't generate names yet.
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@ -293,6 +293,12 @@ virDomainSnapshotDefParseString(const char *xmlStr,
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memoryFile);
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goto cleanup;
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}
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if (!memoryFile &&
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def->memory == VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL) {
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virReportError(VIR_ERR_XML_ERROR, "%s",
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_("external memory snapshots require a filename"));
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goto cleanup;
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}
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} else if (memoryFile) {
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def->memory = VIR_DOMAIN_SNAPSHOT_LOCATION_EXTERNAL;
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} else if (flags & VIR_DOMAIN_SNAPSHOT_PARSE_REDEFINE) {
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