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-rw-r--r--src/vppinfra/vec_bootstrap.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/src/vppinfra/vec_bootstrap.h b/src/vppinfra/vec_bootstrap.h
index 5cf5d3b76a1..e14c4be8e52 100644
--- a/src/vppinfra/vec_bootstrap.h
+++ b/src/vppinfra/vec_bootstrap.h
@@ -213,15 +213,17 @@ u32 vec_len_not_inline (void *v);
#define vec_foreach(var,vec) for (var = (vec); var < vec_end (vec); var++)
/** \brief Vector iterator (reverse) */
-#define vec_foreach_backwards(var,vec) \
-for (var = vec_end (vec) - 1; var >= (vec); var--)
+#define vec_foreach_backwards(var, vec) \
+ if (vec) \
+ for (var = vec_end (vec) - 1; var >= (vec); var--)
/** \brief Iterate over vector indices. */
#define vec_foreach_index(var,v) for ((var) = 0; (var) < vec_len (v); (var)++)
/** \brief Iterate over vector indices (reverse). */
-#define vec_foreach_index_backwards(var,v) \
- for ((var) = vec_len((v)) - 1; (var) >= 0; (var)--)
+#define vec_foreach_index_backwards(var, v) \
+ if (v) \
+ for ((var) = vec_len ((v)) - 1; (var) >= 0; (var)--)
/** \brief return the NUMA index for a vector */
always_inline uword