4.9-stable review patch. If anyone has any objections, please let me know.
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From: Wenjia Zhang wenjia@linux.ibm.com
[ Upstream commit aec45e857c5538664edb76a60dd452e3265f37d1 ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/s390/net/qeth_core_main.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -23,6 +23,7 @@ #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> @@ -4715,7 +4716,7 @@ int qeth_query_oat_command(struct qeth_c
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; @@ -4756,7 +4757,7 @@ int qeth_query_oat_command(struct qeth_c rc = -EFAULT;
out_free: - kfree(priv.buffer); + vfree(priv.buffer); out: return rc; }