diff options
Diffstat (limited to 'vnet/vnet/ip/ip4_mtrie.c')
| -rw-r--r-- | vnet/vnet/ip/ip4_mtrie.c | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/vnet/vnet/ip/ip4_mtrie.c b/vnet/vnet/ip/ip4_mtrie.c index 461cd64b86d..0badde769c2 100644 --- a/vnet/vnet/ip/ip4_mtrie.c +++ b/vnet/vnet/ip/ip4_mtrie.c @@ -436,10 +436,26 @@ maybe_remap_leaf (ip_lookup_main_t * lm, ip4_fib_mtrie_leaf_t * p) if (m) { was_remapped_to_empty_leaf = m == ~0; + + /* + * The intent of the original form - which dates to 2013 or + * earlier - is not obvious. Here's the original: + * + * if (was_remapped_to_empty_leaf) + * p[0] = (was_remapped_to_empty_leaf + * ? IP4_FIB_MTRIE_LEAF_EMPTY + * : ip4_fib_mtrie_leaf_set_adj_index (m - 1)); + * + * Notice the outer "if (was_remapped_to_empty_leaf)" + * means that p[0] is always set to IP4_FIB_MTRIE_LEAF_EMPTY, + * and is otherwise left intact. + * + * It seems unlikely that the adjacency mapping scheme + * works in detail. Coverity correctly complains that the + * else-case of the original ternary expression is dead code. + */ if (was_remapped_to_empty_leaf) - p[0] = (was_remapped_to_empty_leaf - ? IP4_FIB_MTRIE_LEAF_EMPTY - : ip4_fib_mtrie_leaf_set_adj_index (m - 1)); + p[0] = IP4_FIB_MTRIE_LEAF_EMPTY; } } return was_remapped_to_empty_leaf; |