net: Fix from address in memcpy_to_iter_csum()

While inlining csum_and_memcpy() into memcpy_to_iter_csum(), the from
address passed to csum_partial_copy_nocheck() was accidentally changed.
This causes a regression in applications using UDP, as for example
OpenAFS, causing loss of datagrams.

Fixes: dc32bff ("iov_iter, net: Fold in csum_and_memcpy()")
Cc: David Howells <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Michael Lass <[email protected]>
Reviewed-by: Jeffrey Altman <[email protected]>
Acked-by: David Howells <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

net/core/datagram.c

@@ -751,7 +751,7 @@ size_t memcpy_to_iter_csum(void *iter_to, size_t progress,
 			   size_t len, void *from, void *priv2)
 {
 	__wsum *csum = priv2;
-	__wsum next = csum_partial_copy_nocheck(from, iter_to, len);
+	__wsum next = csum_partial_copy_nocheck(from + progress, iter_to, len);
 
 	*csum = csum_block_add(*csum, next, progress);
 	return 0;