From dd6ecace4107ab9686b3a1a5aecced6906c9969e Mon Sep 17 00:00:00 2001
From: uwezkhan06 <uwezkhan055@gmail.com>
Date: Tue, 31 Mar 2026 00:37:02 +0530
Subject: [PATCH] Fix buffer overflow in PROXY protocol header parsing

---
 sql/proxy_protocol.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sql/proxy_protocol.cc b/sql/proxy_protocol.cc
index af56a615eabfa..85d3905432336 100644
--- a/sql/proxy_protocol.cc
+++ b/sql/proxy_protocol.cc
@@ -195,10 +195,10 @@ int parse_proxy_protocol_header(NET *net, proxy_peer_info *peer_info)
   if (have_v1_header)
   {
     /* Read until end of header (newline character)*/
-    while(pos < sizeof(hdr))
+    while(pos < sizeof(hdr) - 1)
     {
       long len= (long)vio_read(vio, hdr + pos, 1);
-      if (len < 0)
+      if (len <= 0)
         return -1;
       pos++;
       if (hdr[pos-1] == '\n')