writev with a zero-length segment is a noop, and we shouldn't return EFAULT.
Signed-off-by: Nick Piggin <npiggin@xxxxxxx>
Index: linux-2.6/include/linux/pagemap.h
===================================================================
--- linux-2.6.orig/include/linux/pagemap.h
+++ linux-2.6/include/linux/pagemap.h
@@ -198,6 +198,9 @@ static inline int fault_in_pages_writeab
{
int ret;
+ if (unlikely(size == 0))
+ return 0;
+
/*
* Writing zeroes into userspace here is OK, because we know that if
* the zero gets there, we'll be overwriting it.
@@ -222,6 +225,9 @@ static inline int fault_in_pages_readabl
volatile char c;
int ret;
+ if (unlikely(size == 0))
+ return 0;
+
ret = __get_user(c, uaddr);
if (ret == 0) {
const char __user *end = uaddr + size - 1;
-
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