[libmicrohttpd] 03/05: postprocessor: fixed undefined behavior error

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karlson2k pushed a commit to branch master
in repository libmicrohttpd.

commit 6c2f3cf24f4a03b1eb3689d7913c11c7671c948f
Author: Evgeny Grin (Karlson2k) <k2k@narod.ru>
AuthorDate: Sun Sep 12 18:08:03 2021 +0300

    postprocessor: fixed undefined behavior error
    
    memcpy() must be called with valid pointers even if size is zero.
    Sanitizer doesn't like 'zero pointer with zero offset' as well.
---
 src/microhttpd/postprocessor.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/src/microhttpd/postprocessor.c b/src/microhttpd/postprocessor.c
index 74f50af5..abe7b437 100644
--- a/src/microhttpd/postprocessor.c
+++ b/src/microhttpd/postprocessor.c
@@ -385,11 +385,14 @@ process_value (struct MHD_PostProcessor *pp,
     if (delta > XBUF_SIZE - xoff)
       delta = XBUF_SIZE - xoff;
     /* move (additional) input into processing buffer */
-    memcpy (&xbuf[xoff],
-            value_start,
-            delta);
-    xoff += delta;
-    value_start += delta;
+    if (0 != delta)
+    {
+      memcpy (&xbuf[xoff],
+              value_start,
+              delta);
+      xoff += delta;
+      value_start += delta;
+    }
     /* find if escape sequence is at the end of the processing buffer;
        if so, exclude those from processing (reduce delta to point at
        end of processed region) */

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