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authorBenoît Ganne <bganne@cisco.com>2019-07-09 13:50:35 +0200
committerNeale Ranns <nranns@cisco.com>2019-07-09 14:32:19 +0000
commit3f5ebed6ea3a024b7396afe81f895719a8286681 (patch)
tree0e6bb672366cb1c659ece8e60d39d9275bde6ec7 /src/vnet
parent57783efb822699ee5acc637580ca855fb9b7e4cc (diff)
fib: fix urpf_itfs vector overflow
When removing duplicates in urpf_itfs vector we search for the 1st next different entry in the vector, but the loop test is in the wrong order: (urpf->furpf_itfs[i] == urpf->furpf_itfs[j] && j < vec_len(urpf->furpf_itfs)) We must check for overflow before checking equality. Type: fix Fixes: 3ee44040c66cbe47ff292ac7fb0badccbe2afe6d Change-Id: I63729aff12057d5abce6c24ec24339cd9cd79494 Signed-off-by: Benoît Ganne <bganne@cisco.com>
Diffstat (limited to 'src/vnet')
-rw-r--r--src/vnet/fib/fib_urpf_list.c61
1 files changed, 16 insertions, 45 deletions
diff --git a/src/vnet/fib/fib_urpf_list.c b/src/vnet/fib/fib_urpf_list.c
index a895729e91a..bd225142a1d 100644
--- a/src/vnet/fib/fib_urpf_list.c
+++ b/src/vnet/fib/fib_urpf_list.c
@@ -132,8 +132,7 @@ static int
fib_urpf_itf_cmp_for_sort (void * v1,
void * v2)
{
- fib_node_index_t *i1 = v1, *i2 = v2;
-
+ const adj_index_t *i1 = v1, *i2 = v2;
return (*i2 < *i1);
}
@@ -151,49 +150,21 @@ fib_urpf_list_bake (index_t ui)
ASSERT(!(urpf->furpf_flags & FIB_URPF_LIST_BAKED));
if (vec_len(urpf->furpf_itfs) > 1)
- {
- u32 i,j;
-
- /*
- * cat list | sort | uniq > rpf_list
- */
- vec_sort_with_function(urpf->furpf_itfs, fib_urpf_itf_cmp_for_sort);
-
- i = 0, j = 1;
- while (j < vec_len(urpf->furpf_itfs))
- {
- if (urpf->furpf_itfs[i] == urpf->furpf_itfs[j])
- {
- /*
- * the itfacenct entries are the same.
- * search forward for a unique one
- */
- while (urpf->furpf_itfs[i] == urpf->furpf_itfs[j] &&
- j < vec_len(urpf->furpf_itfs))
- {
- j++;
- }
- if (j == vec_len(urpf->furpf_itfs))
- {
- /*
- * ran off the end without finding a unique index.
- * we are done.
- */
- break;
- }
- else
- {
- urpf->furpf_itfs[i+1] = urpf->furpf_itfs[j];
- }
- }
- i++, j++;
- }
-
- /*
- * set the length of the vector to the number of unique itfs
- */
- _vec_len(urpf->furpf_itfs) = i+1;
- }
+ {
+ u32 i, j;
+ /*
+ * cat list | sort | uniq > rpf_list
+ */
+ /* sort */
+ vec_sort_with_function(urpf->furpf_itfs, fib_urpf_itf_cmp_for_sort);
+ /* remove duplicates */
+ i = 0;
+ for (j=1; j<vec_len(urpf->furpf_itfs); j++)
+ if (urpf->furpf_itfs[i] != urpf->furpf_itfs[j])
+ urpf->furpf_itfs[++i] = urpf->furpf_itfs[j];
+ /* set the length of the vector to the number of unique itfs */
+ _vec_len(urpf->furpf_itfs) = i+1;
+ }
urpf->furpf_flags |= FIB_URPF_LIST_BAKED;
}