| From | Ben Hutchings <> | Date | Fri, 10 Mar 2017 11:46:10 +0000 | Subject | [PATCH 3.2 043/199] s390/vmlogrdr: fix IUCV buffer allocation |
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3.2.87-rc1 review patch. If anyone has any objections, please let me know.
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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: Ben Hutchings <ben@decadent.org.uk> --- 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 @@ -876,7 +876,7 @@ 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;
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