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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;