From 3c62ad193d4e12905586d6a9fcaca8e980eb76b9 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Fri, 15 Mar 2019 17:16:06 +0100
Subject: [PATCH] HyperLogLog: handle wrong offset in the base case.

---
 src/hyperloglog.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/src/hyperloglog.c b/src/hyperloglog.c
index 3bc664d3e..c0f20815c 100644
--- a/src/hyperloglog.c
+++ b/src/hyperloglog.c
@@ -611,10 +611,7 @@ int hllSparseToDense(robj *o) {
         } else {
             runlen = HLL_SPARSE_VAL_LEN(p);
             regval = HLL_SPARSE_VAL_VALUE(p);
-            if ((runlen + idx) > HLL_REGISTERS) {
-                sdsfree(dense);
-                return C_ERR;
-            }
+            if ((runlen + idx) > HLL_REGISTERS) break; /* Overflow. */
             while(runlen--) {
                 HLL_DENSE_SET_REGISTER(hdr->registers,idx,regval);
                 idx++;
@@ -1085,8 +1082,7 @@ int hllMerge(uint8_t *max, robj *hll) {
             } else {
                 runlen = HLL_SPARSE_VAL_LEN(p);
                 regval = HLL_SPARSE_VAL_VALUE(p);
-                if ((runlen + i) > HLL_REGISTERS)
-                    return C_ERR;
+                if ((runlen + i) > HLL_REGISTERS) break; /* Overflow. */
                 while(runlen--) {
                     if (regval > max[i]) max[i] = regval;
                     i++;