From 74b5c297f5ecbef0ca128fa7b385b43f036a7984 Mon Sep 17 00:00:00 2001 From: Andy King Date: Thu, 19 Feb 2015 10:33:56 -0800 Subject: VMCI: Check userland-provided datagram size Ensure that the size filled in by userland in the datagram header matches the size of the buffer passed down in the IOCTL. Note that we account for the size of the header itself in the check. Acked-by: Jorgen Hansen Acked-by: Aditya Sarwade Signed-off-by: Andy King Reported-by: David Ramos Signed-off-by: Greg Kroah-Hartman --- drivers/misc/vmw_vmci/vmci_host.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/misc/vmw_vmci/vmci_host.c') diff --git a/drivers/misc/vmw_vmci/vmci_host.c b/drivers/misc/vmw_vmci/vmci_host.c index 66fc9921fc85..a721b5d8a9da 100644 --- a/drivers/misc/vmw_vmci/vmci_host.c +++ b/drivers/misc/vmw_vmci/vmci_host.c @@ -395,6 +395,12 @@ static int vmci_host_do_send_datagram(struct vmci_host_dev *vmci_host_dev, return -EFAULT; } + if (VMCI_DG_SIZE(dg) != send_info.len) { + vmci_ioctl_err("datagram size mismatch\n"); + kfree(dg); + return -EINVAL; + } + pr_devel("Datagram dst (handle=0x%x:0x%x) src (handle=0x%x:0x%x), payload (size=%llu bytes)\n", dg->dst.context, dg->dst.resource, dg->src.context, dg->src.resource, -- cgit v1.2.3