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--- sed-4.1.4/lib/regex_internal.c +++ sed-4.1.4/lib/regex_internal.c @@ -883,6 +883,9 @@ re_node_set *set; int size; { + if ( size == 0 ) + return REG_NOERROR; + set->alloc = size; set->nelem = 0; set->elems = re_malloc (int, size);