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s390/qeth: use vzalloc for QUERY OAT buffer

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qeth_query_oat_command() currently allocates the kernel buffer for
the SIOC_QETH_QUERY_OAT ioctl with kzalloc. So on systems with
fragmented memory, large allocations may fail (eg. the qethqoat tool by
default uses 132KB).

Solve this issue by using vzalloc, backing the allocation with
non-contiguous memory.

Signed-off-by: Wenjia Zhang <wenjia@linux.ibm.com>
Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wenjia Zhang 2018-09-12 15:31:34 +02:00 committed by David S. Miller
parent 04db741d0d
commit aec45e857c
1 changed files with 3 additions and 2 deletions
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5
drivers/s390/net/qeth_core_main.c
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@ -25,6 +25,7 @@
#include <linux/netdevice.h>
#include <linux/netdev_features.h>
#include <linux/skbuff.h>
#include <linux/vmalloc.h>
#include <net/iucv/af_iucv.h>
#include <net/dsfield.h>
@ -4699,7 +4700,7 @@ static int qeth_query_oat_command(struct qeth_card *card, char __user *udata)
priv.buffer_len = oat_data.buffer_len;
priv.response_len = 0;
priv.buffer = kzalloc(oat_data.buffer_len, GFP_KERNEL);
priv.buffer = vzalloc(oat_data.buffer_len);
if (!priv.buffer) {
rc = -ENOMEM;
goto out;
@ -4740,7 +4741,7 @@ static int qeth_query_oat_command(struct qeth_card *card, char __user *udata)
rc = -EFAULT;
out_free:
kfree(priv.buffer);
vfree(priv.buffer);
out:
return rc;
}