libmicrohttpd

commit 6c2f3cf24f4a03b1eb3689d7913c11c7671c948f
parent 4017f5a3ed9043e1c9329a3cc91f47be3fee710e
Author: Evgeny Grin (Karlson2k) <k2k@narod.ru>
Date:   Sun, 12 Sep 2021 18:08:03 +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.

Diffstat:
M
src/microhttpd/postprocessor.c
 | 
13
++++++++-----

1 file changed, 8 insertions(+), 5 deletions(-)
diff --git 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) */