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authorNeale Ranns <nranns@cisco.com>2018-10-10 13:27:00 +0000
committerDamjan Marion <dmarion@me.com>2018-10-10 16:03:40 +0000
commit825fc4892ee7ec3cff83b2754cd921c0157e62f8 (patch)
treed3a46d299253c6dbb24cb07d8d53f45e9e36ef69 /src/vlib
parentb9fa29d513bfad0d9f18e8ed8c2da3feaa6d3bf0 (diff)
Integer underflow and out-of-bounds read (VPP-1442)
Change-Id: Ife2a83b9d7f733f36e0e786ef79edcd394d7c0f9 Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vlib')
-rw-r--r--src/vlib/buffer_node.h13
1 files changed, 9 insertions, 4 deletions
diff --git a/src/vlib/buffer_node.h b/src/vlib/buffer_node.h
index 93ffb1e9dce..35e15a5d919 100644
--- a/src/vlib/buffer_node.h
+++ b/src/vlib/buffer_node.h
@@ -366,10 +366,15 @@ vlib_buffer_enqueue_to_next (vlib_main_t * vm, vlib_node_runtime_t * node,
n_enqueued = count_trailing_zeros (~bitmap) / 2;
#else
u16 x = 0;
- x |= next_index ^ nexts[1];
- x |= next_index ^ nexts[2];
- x |= next_index ^ nexts[3];
- n_enqueued = (x == 0) ? 4 : 1;
+ if (count + 3 < max)
+ {
+ x |= next_index ^ nexts[1];
+ x |= next_index ^ nexts[2];
+ x |= next_index ^ nexts[3];
+ n_enqueued = (x == 0) ? 4 : 1;
+ }
+ else
+ n_enqueued = 1;
#endif
if (PREDICT_FALSE (n_enqueued > max))