[tor-bugs] #2320 [Tor Client]: var_cell_t with payload_len 0 risky

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#2320: var_cell_t with payload_len 0 risky
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 Reporter:  arma        |       Owner:                    
     Type:  defect      |      Status:  new               
 Priority:  normal      |   Milestone:  Tor: 0.2.2.x-final
Component:  Tor Client  |     Version:                    
 Keywords:              |      Parent:                    
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Comment(by cypherpunks):

 typedef struct emptycell_t {
   uint8_t payload[1];
 } empty_cell_t;

 empty_cell_t *cell=tor_malloc(0); /* just because we know for sure it's
 zero length. */

 Any sense for cell->payload?
 It's not the same as
 char *end=&cell+0; /*zero length */

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/2320#comment:4>
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