From fdd4391534578d6a5a655eef99ef96e53ff2b4f1 Mon Sep 17 00:00:00 2001
From: shirleyquirk <31934565+shirleyquirk@users.noreply.github.com>
Date: Fri, 16 Apr 2021 13:22:51 +0100
Subject: [PATCH] Fix buffer-overrun bug in net (#17728) [backport:1.0]

---
 changelog.md     | 2 ++
 lib/pure/net.nim | 7 +++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/changelog.md b/changelog.md
index 6dcfab9c69..cfdcd3c629 100644
--- a/changelog.md
+++ b/changelog.md
@@ -40,6 +40,8 @@
 ## Standard library additions and changes
 - Added support for parenthesized expressions in `strformat`
 
+- Fixed buffer overflow bugs in `net`
+
 - Added `sections` iterator in `parsecfg`.
 
 - Make custom op in macros.quote work for all statements.
diff --git a/lib/pure/net.nim b/lib/pure/net.nim
index 9be9c6acbf..343cdc9b1b 100644
--- a/lib/pure/net.nim
+++ b/lib/pure/net.nim
@@ -690,12 +690,11 @@ when defineSsl:
     let ctx = SslContext(context: ssl.SSL_get_SSL_CTX)
     let hintString = if hint == nil: "" else: $hint
     let (identityString, pskString) = (ctx.clientGetPskFunc)(hintString)
-    if psk.len.cuint > max_psk_len:
+    if pskString.len.cuint > max_psk_len:
       return 0
     if identityString.len.cuint >= max_identity_len:
       return 0
-
-    copyMem(identity, identityString.cstring, pskString.len + 1) # with the last zero byte
+    copyMem(identity, identityString.cstring, identityString.len + 1) # with the last zero byte
     copyMem(psk, pskString.cstring, pskString.len)
 
     return pskString.len.cuint
@@ -716,7 +715,7 @@ when defineSsl:
       max_psk_len: cint): cuint {.cdecl.} =
     let ctx = SslContext(context: ssl.SSL_get_SSL_CTX)
     let pskString = (ctx.serverGetPskFunc)($identity)
-    if psk.len.cint > max_psk_len:
+    if pskString.len.cint > max_psk_len:
       return 0
     copyMem(psk, pskString.cstring, pskString.len)