File cve-2021-32762.patch of Package redis.26564

From bb7597f46ee7798531e236a20f41729d5a056050 Mon Sep 17 00:00:00 2001
From: Oran Agra <oran@redislabs.com>
Date: Sun, 26 Sep 2021 15:46:37 +0300
Subject: [PATCH] Fix redis-cli / redis-sential overflow on some platforms
 (CVE-2021-32762)

The redis-cli command line tool and redis-sentinel service may be vulnerable
to integer overflow when parsing specially crafted large multi-bulk network
replies. This is a result of a vulnerability in the underlying hiredis
library which does not perform an overflow check before calling the calloc()
heap allocation function.

This issue only impacts systems with heap allocators that do not perform their
own overflow checks. Most modern systems do and are therefore not likely to
be affected. Furthermore, by default redis-sentinel uses the jemalloc allocator
which is also not vulnerable.
---
 deps/hiredis/hiredis.c |  1 +
 deps/hiredis/test.c    | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/deps/hiredis/hiredis.c b/deps/hiredis/hiredis.c
index abd94c01d2a8..dbfe1a989de8 100644
--- a/deps/hiredis/hiredis.c
+++ b/deps/hiredis/hiredis.c
@@ -168,6 +168,7 @@ static void *createArrayObject(const redisReadTask *task, size_t elements) {
         return NULL;
 
     if (elements > 0) {
+        if (SIZE_MAX / sizeof(redisReply*) < elements) return NULL;  /* Don't overflow */
         r->element = calloc(elements,sizeof(redisReply*));
         if (r->element == NULL) {
             freeReplyObject(r);
diff --git a/deps/hiredis/test.c b/deps/hiredis/test.c
index 8668e18567ae..9760862193e2 100644
--- a/deps/hiredis/test.c
+++ b/deps/hiredis/test.c
@@ -400,6 +400,20 @@ static void test_reply_reader(void) {
     freeReplyObject(reply);
     redisReaderFree(reader);
 
+    test("Multi-bulk never overflows regardless of maxelements: ");
+    size_t bad_mbulk_len = (SIZE_MAX / sizeof(void *)) + 3;
+    char bad_mbulk_reply[100];
+    snprintf(bad_mbulk_reply, sizeof(bad_mbulk_reply), "*%llu\r\n+asdf\r\n",
+        (unsigned long long) bad_mbulk_len);
+
+    reader = redisReaderCreate();
+    reader->maxelements = 0;    /* Don't rely on default limit */
+    redisReaderFeed(reader, bad_mbulk_reply, strlen(bad_mbulk_reply));
+    ret = redisReaderGetReply(reader,&reply);
+    test_cond(ret == REDIS_ERR && strcasecmp(reader->errstr, "Out of memory") == 0);
+    freeReplyObject(reply);
+    redisReaderFree(reader);
+
 #if LLONG_MAX > SIZE_MAX
     test("Set error when array > SIZE_MAX: ");
     reader = redisReaderCreate();