From a011fe84503b2af9d4ba637441adc4c9a95fa787 Mon Sep 17 00:00:00 2001
From: kannappanr <30541348+kannappanr@users.noreply.github.com>
Date: Thu, 26 Oct 2017 18:01:46 -0700
Subject: [PATCH] "0" offset is ignored in  GetObject method in Azure Gateway
 code (#5118)

In GetObject method, Check if startoffset is a non-negative value.
Ignore check for startOffset > and check for only length > 0.

Fixes minio/mint#191
---
 cmd/gateway-azure.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/cmd/gateway-azure.go b/cmd/gateway-azure.go
index 5718f856e..12eb442b5 100644
--- a/cmd/gateway-azure.go
+++ b/cmd/gateway-azure.go
@@ -469,8 +469,13 @@ func (a *azureObjects) ListObjectsV2(bucket, prefix, continuationToken, delimite
 // startOffset indicates the starting read location of the object.
 // length indicates the total length of the object.
 func (a *azureObjects) GetObject(bucket, object string, startOffset int64, length int64, writer io.Writer) error {
+	// startOffset cannot be negative.
+	if startOffset < 0 {
+		return toObjectErr(traceError(errUnexpected), bucket, object)
+	}
+
 	blobRange := &storage.BlobRange{Start: uint64(startOffset)}
-	if length > 0 && startOffset > 0 {
+	if length > 0 {
 		blobRange.End = uint64(startOffset + length - 1)
 	}