[GNUnet-SVN] [gnunet] branch master updated: assert block length is valid

[gnunet]

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martin-schanzenbach pushed a commit to branch master
in repository gnunet.

The following commit(s) were added to refs/heads/master by this push:
     new 1c47189bb assert block length is valid
1c47189bb is described below

commit 1c47189bb16bffe75dec2c3c666e39790841aa84
Author: Schanzenbach, Martin <address@hidden>
AuthorDate: Sun Jun 24 23:27:39 2018 +0200

    assert block length is valid
---
 src/namecache/namecache_api.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/namecache/namecache_api.c b/src/namecache/namecache_api.c
index 2bb233da1..2a60a2813 100644
--- a/src/namecache/namecache_api.c
+++ b/src/namecache/namecache_api.c
@@ -483,9 +483,11 @@ GNUNET_NAMECACHE_block_cache (struct 
GNUNET_NAMECACHE_Handle *h,
 
   if (NULL == h->mq)
     return NULL;
-  blen = ntohl (block->purpose.size)
-    - sizeof (struct GNUNET_TIME_AbsoluteNBO)
-    - sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose);
+  blen = ntohl (block->purpose.size);
+  GNUNET_assert (blen > (sizeof (struct GNUNET_TIME_AbsoluteNBO) + 
+                         sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose)));
+  blen -= (sizeof (struct GNUNET_TIME_AbsoluteNBO) +
+           sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose));
   rid = get_op_id (h);
   qe = GNUNET_new (struct GNUNET_NAMECACHE_QueueEntry);
   qe->nsh = h;

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