Commit 9652b62a authored by Gerald Schaefer's avatar Gerald Schaefer Committed by Greg Kroah-Hartman

s390/vmlogrdr: fix IUCV buffer allocation

commit 5457e03d 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: default avatarGerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f356ab03
...@@ -870,7 +870,7 @@ static int __init vmlogrdr_init(void) ...@@ -870,7 +870,7 @@ static int __init vmlogrdr_init(void)
goto cleanup; goto cleanup;
for (i=0; i < MAXMINOR; ++i ) { 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) { if (!sys_ser[i].buffer) {
rc = -ENOMEM; rc = -ENOMEM;
break; break;
......
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