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libjail: Guard against programmer error in jailparam_export()
If the caller didn't use jailparam_import() to fetch the parameter value, an attempt to export it will trigger a segfault. Make it a bit easier to figure out what's happening in this situation. PR: 276809 Reviewed by: jamie MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D43732
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@ -737,6 +737,12 @@ jailparam_export(struct jailparam *jp)
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int i, nval, ival;
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char valbuf[INET6_ADDRSTRLEN];
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if (jp->jp_value == NULL) {
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snprintf(jail_errmsg, JAIL_ERRMSGLEN,
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"parameter %s was not imported", jp->jp_name);
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errno = EINVAL;
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return (NULL);
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}
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if ((jp->jp_ctltype & CTLTYPE) == CTLTYPE_STRING) {
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value = strdup(jp->jp_value);
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if (value == NULL)
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