Patch "s390/vmlogrdr: fix IUCV buffer allocation" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

s390/vmlogrdr: fix IUCV buffer allocation

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
s390-vmlogrdr-fix-iucv-buffer-allocation.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Gerald Schaefer <[email protected]>
Date: Mon, 21 Nov 2016 12:13:58 +0100
Subject: s390/vmlogrdr: fix IUCV buffer allocation

From: Gerald Schaefer <[email protected]>

commit 5457e03de918f7a3e294eb9d26a608ab8a579976 upstream.

The buffer for iucv_message_receive() needs to be below 2 GB. In __iucv_message_receive(), the buffer address is casted to an u32, which would result in either memory corruption or an addressing exception when using addresses >= 2 GB.

Fix this by using GFP_DMA for the buffer allocation.

---
 drivers/s390/char/vmlogrdr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -870,7 +870,7 @@ static int __init vmlogrdr_init(void)
 		goto cleanup;
 
 	for (i=0; i < MAXMINOR; ++i ) {
-		sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL);
+		sys_ser[i].buffer = (char *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
 		if (!sys_ser[i].buffer) {
 			rc = -ENOMEM;
 			break;

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/s390-vmlogrdr-fix-iucv-buffer-allocation.patch