From: Florian Dold <florian.dold@gmail.com>
Date: Fri, 24 Apr 2020 08:20:05 +0000 (+0530)
Subject: check for integer overflow in buffer lib (fixes #6217)
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=892bd3c6013f0a8c44106f16299a34d9a1c99e48;p=oweals%2Fgnunet.git

check for integer overflow in buffer lib (fixes #6217)
---

diff --git a/src/util/buffer.c b/src/util/buffer.c
index 8efb3e284..dabf630c7 100644
--- a/src/util/buffer.c
+++ b/src/util/buffer.c
@@ -56,6 +56,8 @@ GNUNET_buffer_ensure_remaining (struct GNUNET_Buffer *buf,
 {
   size_t new_capacity = buf->position + n;
 
+  /* guard against overflow */
+  GNUNET_assert (new_capacity >= buf->position);
   if (new_capacity <= buf->capacity)
     return;
   /* warn if calculation of expected size was wrong */