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[GNUnet-SVN] [libmicrohttpd] 02/02: sha256_update(): added shortcut for


From: gnunet
Subject: [GNUnet-SVN] [libmicrohttpd] 02/02: sha256_update(): added shortcut for empty data, avoid wrong/undefined behaviour of memcpy() with null pointer
Date: Fri, 19 Apr 2019 09:36:03 +0200

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karlson2k pushed a commit to branch master
in repository libmicrohttpd.

commit 78a903946d707cab78c5eb996312deccb3f68c82
Author: Evgeny Grin (Karlson2k) <address@hidden>
AuthorDate: Fri Apr 19 10:35:35 2019 +0300

    sha256_update(): added shortcut for empty data,
    avoid wrong/undefined behaviour of memcpy() with null pointer
---
 src/microhttpd/sha256.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/microhttpd/sha256.c b/src/microhttpd/sha256.c
index 2c3c057d..e3989d57 100644
--- a/src/microhttpd/sha256.c
+++ b/src/microhttpd/sha256.c
@@ -250,6 +250,9 @@ sha256_update (void *ctx_,
 
   mhd_assert((data != NULL) || (length == 0));
 
+  if (0 == length)
+    return; /* Do nothing */
+
   /* Note: (count & (SHA256_BLOCK_SIZE-1))
            equal (count % SHA256_BLOCK_SIZE) for this block size. */
   bytes_have = (unsigned)(ctx->count & (SHA256_BLOCK_SIZE-1));

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