| From 5457e03de918f7a3e294eb9d26a608ab8a579976 Mon Sep 17 00:00:00 2001 |
| From: Gerald Schaefer <gerald.schaefer@de.ibm.com> |
| Date: Mon, 21 Nov 2016 12:13:58 +0100 |
| Subject: s390/vmlogrdr: fix IUCV buffer allocation |
| |
| From: Gerald Schaefer <gerald.schaefer@de.ibm.com> |
| |
| 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. |
| |
| Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> |
| Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| |
| --- |
| drivers/s390/char/vmlogrdr.c | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/drivers/s390/char/vmlogrdr.c |
| +++ b/drivers/s390/char/vmlogrdr.c |
| @@ -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; |
