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be2iscsi: check ip buffer before copying 

commit a41a9ad3bbf61fae0b6bfb232153da60d14fdbd9 upstream.

Dan Carpenter found a issue where be2iscsi would copy the ip
from userspace to the driver buffer before checking the len
of the data being copied:
http://marc.info/?l=linux-scsi&m=140982651504251&w=2

This patch just has us only copy what we the driver buffer
can support.

Tested-by: John Soni Jose <sony.john-n@emulex.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mike Christie 2014-09-29 13:55:41 -05:00 committed by Greg Kroah-Hartman
parent a110e6d6eb
commit 39d6457473
1 changed files with 8 additions and 5 deletions
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13
drivers/scsi/be2iscsi/be_mgmt.c
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@ -812,17 +812,20 @@ mgmt_static_ip_modify(struct beiscsi_hba *phba,
if (ip_action == IP_ACTION_ADD) {
memcpy(req->ip_params.ip_record.ip_addr.addr, ip_param->value,
ip_param->len);
sizeof(req->ip_params.ip_record.ip_addr.addr));
if (subnet_param)
memcpy(req->ip_params.ip_record.ip_addr.subnet_mask,
subnet_param->value, subnet_param->len);
subnet_param->value,
sizeof(req->ip_params.ip_record.ip_addr.subnet_mask));
} else {
memcpy(req->ip_params.ip_record.ip_addr.addr,
if_info->ip_addr.addr, ip_param->len);
if_info->ip_addr.addr,
sizeof(req->ip_params.ip_record.ip_addr.addr));
memcpy(req->ip_params.ip_record.ip_addr.subnet_mask,
if_info->ip_addr.subnet_mask, ip_param->len);
if_info->ip_addr.subnet_mask,
sizeof(req->ip_params.ip_record.ip_addr.subnet_mask));
}
rc = mgmt_exec_nonemb_cmd(phba, &nonemb_cmd, NULL, 0);
@ -850,7 +853,7 @@ static int mgmt_modify_gateway(struct beiscsi_hba *phba, uint8_t *gt_addr,
req->action = gtway_action;
req->ip_addr.ip_type = BE2_IPV4;
memcpy(req->ip_addr.addr, gt_addr, param_len);
memcpy(req->ip_addr.addr, gt_addr, sizeof(req->ip_addr.addr));
return mgmt_exec_nonemb_cmd(phba, &nonemb_cmd, NULL, 0);
}