return None if nbloom is zero to avoid potential overflows in malformed gnu hash headers

src/hash.rs

@@ -256,8 +256,9 @@ impl<'data, E: EndianParse> GnuHashTable<'data, E> {
         symtab: &SymbolTable<'data, E>,
         strtab: &StringTable<'data>,
     ) -> Result<Option<(usize, Symbol)>, ParseError> {
-        // empty hash tables don't have any entries. This avoids a divde by zero in the modulus calculation
-        if self.buckets.is_empty() {
+        // empty hash tables don't have any entries. This avoids a divde by zero in the modulus calculation,
+        // and also avoids a potential overflow in the bloom filter calculation.
+        if self.buckets.is_empty() || self.hdr.nbloom == 0 {
             return Ok(None);
         }