From 9f24ca5d66dfe96129bf100dd83b7edd8cf6b93d Mon Sep 17 00:00:00 2001
From: jiuker <2818723467@qq.com>
Date: Tue, 27 May 2025 23:18:26 +0800
Subject: [PATCH] fix: empty fileName cause Reader nil for
 PostPolicyBucketHandler (#21323)

---
 cmd/bucket-handlers.go | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/cmd/bucket-handlers.go b/cmd/bucket-handlers.go
index b67b7c36a..21231d397 100644
--- a/cmd/bucket-handlers.go
+++ b/cmd/bucket-handlers.go
@@ -1089,6 +1089,14 @@ func (api objectAPIHandlers) PostPolicyBucketHandler(w http.ResponseWriter, r *h
 		break
 	}
 
+	// check if have a file
+	if reader == nil {
+		apiErr := errorCodes.ToAPIErr(ErrMalformedPOSTRequest)
+		apiErr.Description = fmt.Sprintf("%s (%v)", apiErr.Description, errors.New("The file or text content is missing"))
+		writeErrorResponse(ctx, w, apiErr, r.URL)
+		return
+	}
+
 	if keyName, ok := formValues["Key"]; !ok {
 		apiErr := errorCodes.ToAPIErr(ErrMalformedPOSTRequest)
 		apiErr.Description = fmt.Sprintf("%s (%v)", apiErr.Description, errors.New("The name of the uploaded key is missing"))