# HG changeset patch
# User Roman Arutyunyan <arut@nginx.com>
# Date 1593783691 -10800
# Node ID 2576485b93d46444784aaa9d5ff66fde901ae9c0
# Parent  153bffee3d7e5357ea784243688483028fa1f7ac
HTTP/3: fixed overflow in prefixed integer parser.

Previously, the expression (ch & 0x7f) was promoted to a signed integer.
Depending on the platform, the size of this integer could be less than 8 bytes,
leading to overflow when handling the higher bits of the result.  Also, sign
bit of this integer could be replicated when adding to the 64-bit st->value.

diff --git a/src/http/v3/ngx_http_v3_parse.c b/src/http/v3/ngx_http_v3_parse.c
--- a/src/http/v3/ngx_http_v3_parse.c
+++ b/src/http/v3/ngx_http_v3_parse.c
@@ -118,7 +118,7 @@ ngx_http_v3_parse_prefix_int(ngx_connect
 
     case sw_value:
 
-        st->value += (ch & 0x7f) << st->shift;
+        st->value += (uint64_t) (ch & 0x7f) << st->shift;
         if (ch & 0x80) {
             st->shift += 7;
             break;