D31383.diff
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	Index: lib/libc/stdio/fread.c
	===================================================================
	--- lib/libc/stdio/fread.c
	+++ lib/libc/stdio/fread.c
	@@ -39,6 +39,7 @@
	__FBSDID("$FreeBSD$");

	#include "namespace.h"
	+#include <assert.h>
	#include <errno.h>
	#include <stdint.h>
	#include <stdio.h>
	@@ -129,8 +130,12 @@
	}

	while (resid > (r = fp->_r)) {
	- (void)memcpy((void )p, (void )fp->_p, (size_t)r);
	- fp->_p += r;
	+ if (fp->_p) {
	+ (void)memcpy((void )p, (void )fp->_p, (size_t)r);
	+ fp->_p += r;
	+ } else {
	+ assert(r == 0);
	+ }
	/* fp->_r = 0 ... done in __srefill */
	p += r;
	resid -= r;