From f91b82e688e7a9f2b843a121748d4b5b4f1180b6 Mon Sep 17 00:00:00 2001
From: Daniel Stenberg <daniel@haxx.se>
Date: Mon, 23 Sep 2019 11:04:13 +0200
Subject: [PATCH] http2: A value is being subtracted from the unsigned variable

PVS-Studio warning
Fixes #4402
---
 lib/http2.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/http2.c b/lib/http2.c
index b33782cc3..1481d1425 100644
--- a/lib/http2.c
+++ b/lib/http2.c
@@ -1775,8 +1775,9 @@ static ssize_t http2_recv(struct connectdata *conn, int sockindex,
    field list. */
 #define AUTHORITY_DST_IDX 3
 
+/* USHRT_MAX is 65535 == 0xffff */
 #define HEADER_OVERFLOW(x) \
-  (x.namelen > (uint16_t)-1 || x.valuelen > (uint16_t)-1 - x.namelen)
+  (x.namelen > 0xffff || x.valuelen > 0xffff - x.namelen)
 
 /*
  * Check header memory for the token "trailers".
-- 
2.40.0