Commit f8c36e2b authored by Gerald Schaefer's avatar Gerald Schaefer Committed by Sasha Levin

s390/vmlogrdr: fix IUCV buffer allocation

[ Upstream commit 5457e03d ]

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.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarGerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@verizon.com>
parent 0848a267
......@@ -872,7 +872,7 @@ 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;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment