Fix off-by-one bug in xlog reading logic

Bug reported by Michael Paquier

Author: Andres Freund

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 3ac3b767dd006e7f4eef4bdfb0a3ea269ce26518..9ad92271795b5904887cf58d5843c5d6c0dcbf17 100644 (file)
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -8875,7 +8875,7 @@ retry:
    /* See if we need to retrieve more data */
    if (readFile < 0 ||
        (readSource == XLOG_FROM_STREAM &&
-        receivedUpto <= targetPagePtr + reqLen))
+        receivedUpto < targetPagePtr + reqLen))
    {
        if (StandbyMode)
        {