SERVER-62205 Check maxChunkSize parameter in (auto)splitVector requests

2 files changed, 12 insertions, 0 deletions

diff --git a/src/mongo/db/s/auto_split_vector_command.cpp b/src/mongo/db/s/auto_split_vector_command.cpp
index 32275403eff..1dd6b15df10 100644
--- a/src/mongo/db/s/auto_split_vector_command.cpp
+++ b/src/mongo/db/s/auto_split_vector_command.cpp
@@ -39,6 +39,8 @@
 namespace mongo {
 namespace {
 
+static constexpr int64_t kSmallestChunkSizeSupported = 1024 * 1024;
+
 class AutoSplitVectorCommand final : public TypedCommand<AutoSplitVectorCommand> {
 public:
     AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
@@ -67,6 +69,11 @@ public:
 
             const auto& req = request();
 
+            uassert(ErrorCodes::ErrorCodes::InvalidOptions,
+                    str::stream() << "maxChunksSizeBytes cannot be smaller than "
+                                  << kSmallestChunkSizeSupported,
+                    req.getMaxChunkSizeBytes() >= kSmallestChunkSizeSupported);
+
             auto splitKeys = autoSplitVector(opCtx,
                                              ns(),
                                              req.getKeyPattern(),
diff --git a/src/mongo/db/s/split_vector_command.cpp b/src/mongo/db/s/split_vector_command.cpp
index 6efe68ca5f2..3d2ba885bb7 100644
--- a/src/mongo/db/s/split_vector_command.cpp
+++ b/src/mongo/db/s/split_vector_command.cpp
@@ -133,6 +133,11 @@ public:
             maxChunkSizeBytes = maxSizeBytesElem.numberLong();
         }
 
+        if (maxChunkSizeBytes.is_initialized() && *maxChunkSizeBytes < 1024 * 1024) {
+            errmsg = "maxChunkSize must be at least 1MB";
+            return false;
+        }
+
         auto splitKeys = splitVector(opCtx,
                                      nss,
                                      keyPattern,