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Subject[PATCH 4.20 49/65] RDMA/iwcm: Dont copy past the end of dev_name() string
4.20-stable review patch.  If anyone has any objections, please let me know.


From: Steve Wise <>

commit d53ec8af56d5163f8a42e961ece3aeb5c560e79d upstream.

We now use dev_name(&ib_device->dev) instead of ib_device->name in iwpm
messages. The name field in struct device is a const char *, where as
ib_device->name is a char array of size IB_DEVICE_NAME_MAX, and it is
pre-initialized to zeros.

Since iw_cm_map() was using memcpy() to copy in the device name, and
copying IWPM_DEVNAME_SIZE bytes, it ends up copying past the end of the
source device name string and copying random bytes. This results in iwpmd
failing the REGISTER_PID request from iwcm. Thus port mapping is broken.

Validate the device and if names, and use strncpy() to inialize the entire
message field.

Fixes: 896de0090a85 ("RDMA/core: Use dev_name instead of ibdev->name")
Signed-off-by: Steve Wise <>
Signed-off-by: Jason Gunthorpe <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/infiniband/core/iwcm.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/infiniband/core/iwcm.c
+++ b/drivers/infiniband/core/iwcm.c
@@ -502,17 +502,21 @@ static void iw_cm_check_wildcard(struct
static int iw_cm_map(struct iw_cm_id *cm_id, bool active)
+ const char *devname = dev_name(&cm_id->device->dev);
+ const char *ifname = cm_id->device->iwcm->ifname;
struct iwpm_dev_data pm_reg_msg;
struct iwpm_sa_data pm_msg;
int status;

+ if (strlen(devname) >= sizeof(pm_reg_msg.dev_name) ||
+ strlen(ifname) >= sizeof(pm_reg_msg.if_name))
+ return -EINVAL;
cm_id->m_local_addr = cm_id->local_addr;
cm_id->m_remote_addr = cm_id->remote_addr;

- memcpy(pm_reg_msg.dev_name, dev_name(&cm_id->device->dev),
- sizeof(pm_reg_msg.dev_name));
- memcpy(pm_reg_msg.if_name, cm_id->device->iwcm->ifname,
- sizeof(pm_reg_msg.if_name));
+ strncpy(pm_reg_msg.dev_name, devname, sizeof(pm_reg_msg.dev_name));
+ strncpy(pm_reg_msg.if_name, ifname, sizeof(pm_reg_msg.if_name));

if (iwpm_register_pid(&pm_reg_msg, RDMA_NL_IWCM) ||

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