5.4-stable review patch. If anyone has any objections, please let me know.
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From: Lin Ma linma@zju.edu.cn
[ Upstream commit ee0268f230f66cb472df3424f380ea668da2749a ]
beiscsi_iface_set_param() parses nlattr with nla_for_each_attr and assumes every attributes can be viewed as struct iscsi_iface_param_info.
This is not true because there is no any nla_policy to validate the attributes passed from the upper function iscsi_set_iface_params().
Add the nla_len check before accessing the nlattr data and return EINVAL if the length check fails.
Fixes: 0e43895ec1f4 ("[SCSI] be2iscsi: adding functionality to change network settings using iscsiadm") Signed-off-by: Lin Ma linma@zju.edu.cn Link: https://lore.kernel.org/r/20230723075938.3713864-1-linma@zju.edu.cn Reviewed-by: Chris Leech cleech@redhat.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/be2iscsi/be_iscsi.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/scsi/be2iscsi/be_iscsi.c b/drivers/scsi/be2iscsi/be_iscsi.c index 2058d50d62e12..737d7087723af 100644 --- a/drivers/scsi/be2iscsi/be_iscsi.c +++ b/drivers/scsi/be2iscsi/be_iscsi.c @@ -441,6 +441,10 @@ int beiscsi_iface_set_param(struct Scsi_Host *shost, }
nla_for_each_attr(attrib, data, dt_len, rm_len) { + /* ignore nla_type as it is never used */ + if (nla_len(attrib) < sizeof(*iface_param)) + return -EINVAL; + iface_param = nla_data(attrib);
if (iface_param->param_type != ISCSI_NET_PARAM)