4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Roland Dreier roland@purestorage.com
commit 8435168d50e66fa5eae01852769d20a36f9e5e83 upstream.
Check to make sure that ctx->cm_id->device is set before we use it. Otherwise userspace can trigger a NULL dereference by doing RDMA_USER_CM_CMD_SET_OPTION on an ID that is not bound to a device.
Cc: stable@vger.kernel.org Reported-by: syzbot+a67bc93e14682d92fc2f@syzkaller.appspotmail.com Signed-off-by: Roland Dreier roland@purestorage.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/infiniband/core/ucma.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -1231,6 +1231,9 @@ static int ucma_set_ib_path(struct ucma_ if (!optlen) return -EINVAL;
+ if (!ctx->cm_id->device) + return -EINVAL; + memset(&sa_path, 0, sizeof(sa_path));
ib_sa_unpack_path(path_data->path_rec, &sa_path);