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-rw-r--r--stdio-common/printf_fp.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/stdio-common/printf_fp.c b/stdio-common/printf_fp.c
index d63be7f92d..43c43c2039 100644
--- a/stdio-common/printf_fp.c
+++ b/stdio-common/printf_fp.c
@@ -1204,6 +1204,10 @@ ___printf_fp (FILE *fp,
 #ifdef COMPILE_WPRINTF
 	  wstartp = _i18n_number_rewrite (wstartp, wcp,
 					  wbuffer + wbuffer_to_alloc);
+	  wcp = wbuffer + wbuffer_to_alloc;
+	  assert ((uintptr_t) wbuffer <= (uintptr_t) wstartp);
+	  assert ((uintptr_t) wstartp
+		  < (uintptr_t) wbuffer + wbuffer_to_alloc);
 #else
 	  tmpptr = _i18n_number_rewrite (tmpptr, cp, buffer_end);
 	  cp = buffer_end;