From: Zoltan Fridrich <zfridric@redhat.com>
Date: Sat, 24 Sep 2022 08:56:31 +0000 (+0200)
Subject: Avoid calling hash update with NULL input (and zero length)
X-Git-Tag: nettle_3.9_release_20230514~61
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f5fc30a1ef490079102d96ccc6d883f933be23c2;p=thirdparty%2Fnettle.git

Avoid calling hash update with NULL input (and zero length)
---

diff --git a/balloon.c b/balloon.c
index 75240ab4..d135ee86 100644
--- a/balloon.c
+++ b/balloon.c
@@ -61,8 +61,10 @@ hash(void *ctx,
   uint8_t tmp[8];
   LE_WRITE_UINT64(tmp, cnt);
   update(ctx, sizeof(tmp), tmp);
-  update(ctx, a_len, a);
-  update(ctx, b_len, b);
+  if (a && a_len)
+    update(ctx, a_len, a);
+  if (b && b_len)
+    update(ctx, b_len, b);
   digest(ctx, digest_size, dst);
 }