From 5376755a335cc1bf68910663b0c20e96a1a9530d Mon Sep 17 00:00:00 2001
From: Yehuda Sadeh <yehuda@redhat.com>
Date: Wed, 6 Jun 2018 10:00:47 -0700
Subject: [PATCH] cls/rgw: don't assert in decode_list_index_key()

Fixes: http://tracker.ceph.com/issues/24117

Signed-off-by: Yehuda Sadeh <yehuda@redhat.com>
(cherry picked from commit e71fba0c6f5b3b0572b5136840cf0ed3c9186569)
---
 src/cls/rgw/cls_rgw.cc | 44 ++++++++++++++++++++++++++++--------------
 1 file changed, 30 insertions(+), 14 deletions(-)

diff --git a/src/cls/rgw/cls_rgw.cc b/src/cls/rgw/cls_rgw.cc
index bb8876cf8a4fa..cc3eb0c253ad5 100644
--- a/src/cls/rgw/cls_rgw.cc
+++ b/src/cls/rgw/cls_rgw.cc
@@ -311,12 +311,20 @@ static void split_key(const string& key, list<string>& vals)
   }
 }
 
+static string escape_str(const string& s)
+{
+  int len = escape_json_attr_len(s.c_str(), s.size());
+  std::string escaped(len, 0);
+  escape_json_attr(s.c_str(), s.size(), escaped.data());
+  return escaped;
+}
+
 /*
  * list index key structure:
  *
  * <obj name>\0[v<ver>\0i<instance id>]
  */
-static void decode_list_index_key(const string& index_key, cls_rgw_obj_key *key, uint64_t *ver)
+static int decode_list_index_key(const string& index_key, cls_rgw_obj_key *key, uint64_t *ver)
 {
   size_t len = strlen(index_key.c_str());
 
@@ -325,19 +333,25 @@ static void decode_list_index_key(const string& index_key, cls_rgw_obj_key *key,
 
   if (len == index_key.size()) {
     key->name = index_key;
-    return;
+    return 0;
   }
 
   list<string> vals;
   split_key(index_key, vals);
 
-  assert(!vals.empty());
+  if (vals.empty()) {
+    CLS_LOG(0, "ERROR: %s(): bad index_key (%s): split_key() returned empty vals", __func__, escape_str(index_key).c_str());
+    return -EIO;
+  }
 
   list<string>::iterator iter = vals.begin();
   key->name = *iter;
   ++iter;
 
-  assert(iter != vals.end());
+  if (iter == vals.end()) {
+    CLS_LOG(0, "ERROR: %s(): bad index_key (%s): no vals", __func__, escape_str(index_key).c_str());
+    return -EIO;
+  }
 
   for (; iter != vals.end(); ++iter) {
     string& val = *iter;
@@ -347,9 +361,14 @@ static void decode_list_index_key(const string& index_key, cls_rgw_obj_key *key,
       string err;
       const char *s = val.c_str() + 1;
       *ver = strict_strtoll(s, 10, &err);
-      assert(err.empty());
+      if (!err.empty()) {
+        CLS_LOG(0, "ERROR: %s(): bad index_key (%s): could not parse val (v=%s)", __func__, escape_str(index_key).c_str(), s);
+        return -EIO;
+      }
     }
   }
+
+  return 0;
 }
 
 static int read_bucket_header(cls_method_context_t hctx, struct rgw_bucket_dir_header *header)
@@ -430,11 +449,16 @@ int rgw_bucket_list(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
 
       cls_rgw_obj_key key;
       uint64_t ver;
-      decode_list_index_key(kiter->first, &key, &ver);
 
       start_key = kiter->first;
       CLS_LOG(20, "start_key=%s len=%zu", start_key.c_str(), start_key.size());
 
+      int ret = decode_list_index_key(kiter->first, &key, &ver);
+      if (ret < 0) {
+        CLS_LOG(0, "ERROR: failed to decode list index key (%s)\n", escape_str(kiter->first).c_str());
+        continue;
+      }
+
       if (!entry.is_valid()) {
         CLS_LOG(20, "entry %s[%s] is not valid\n", key.name.c_str(), key.instance.c_str());
         continue;
@@ -992,14 +1016,6 @@ static void update_olh_log(struct rgw_bucket_olh_entry& olh_data_entry, OLHLogOp
   log.push_back(log_entry);
 }
 
-static string escape_str(const string& s)
-{
-  int len = escape_json_attr_len(s.c_str(), s.size());
-  std::string escaped(len, 0);
-  escape_json_attr(s.c_str(), s.size(), escaped.data());
-  return escaped;
-}
-
 static int write_obj_instance_entry(cls_method_context_t hctx, struct rgw_bucket_dir_entry& instance_entry, const string& instance_idx)
 {
   CLS_LOG(20, "write_entry() instance=%s idx=%s flags=%d", escape_str(instance_entry.key.instance).c_str(), instance_idx.c_str(), instance_entry.flags);
-- 
2.39.5