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diff lib/unistr/u-cpy-alloc.h @ 40212:8da9577294da

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unistr/*, uniconv/*: Fix undefined behaviour. Reported by Jeffrey Walton <noloader@gmail.com>. * lib/unistr/u-cpy.h (FUNC): Don't invoke memcpy with a zero size. * lib/unistr/u-cpy-alloc.h (FUNC): Likewise. * lib/uniconv/u8-conv-from-enc.c (u8_conv_from_encoding): Likewise. * lib/uniconv/u8-conv-to-enc.c (u8_conv_to_encoding): Likewise.
author Bruno Haible <bruno@clisp.org>
date Sat, 09 Mar 2019 00:01:47 +0100
parents b06060465f09
children
line wrap: on
line diff
--- a/lib/unistr/u-cpy-alloc.h	Fri Mar 08 20:38:22 2019 +0100
+++ b/lib/unistr/u-cpy-alloc.h	Sat Mar 09 00:01:47 2019 +0100
@@ -33,7 +33,8 @@
       for (; n > 0; n--)
         *destptr++ = *s++;
 #else
-      memcpy ((char *) dest, (const char *) s, n * sizeof (UNIT));
+      if (n > 0)
+        memcpy ((char *) dest, (const char *) s, n * sizeof (UNIT));
 #endif
     }
   return dest;