[PATCH 3.16 089/192] RDMA/uverbs: Check port number supplied by user verbs cmds

[Ben Hutchings]

3.16.49-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Boris Pismenny <borisp@xxxxxxxxxxxx>

commit 5ecce4c9b17bed4dc9cb58bfb10447307569b77b upstream.

The ib_uverbs_create_ah() ind ib_uverbs_modify_qp() calls receive
the port number from user input as part of its attributes and assumes
it is valid. Down on the stack, that parameter is used to access kernel
data structures.  If the value is invalid, the kernel accesses memory
it should not.  To prevent this, verify the port number before using it.

BUG: KASAN: use-after-free in ib_uverbs_create_ah+0x6d5/0x7b0
Read of size 4 at addr ffff880018d67ab8 by task syz-executor/313

BUG: KASAN: slab-out-of-bounds in modify_qp.isra.4+0x19d0/0x1ef0
Read of size 4 at addr ffff88006c40ec58 by task syz-executor/819

Fixes: 67cdb40ca444 ("[IB] uverbs: Implement more commands")
Fixes: 189aba99e70 ("IB/uverbs: Extend modify_qp and support packet pacing")
Cc: <security@xxxxxxxxxx>
Cc: Yevgeny Kliteynik <kliteyn@xxxxxxxxxxxx>
Cc: Tziporet Koren <tziporet@xxxxxxxxxxxx>
Cc: Alex Polak <alexpo@xxxxxxxxxxxx>
Signed-off-by: Boris Pismenny <borisp@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
[bwh: Backported to 3.16:
 - In modify_qp(), command structure is cmd not cmd->base
 - In ib_uverbs_create_ah(), add definition of ib_dev
 - Adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/infiniband/core/uverbs_cmd.c | 8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1915,6 +1915,11 @@ ssize_t ib_uverbs_modify_qp(struct ib_uv
 		goto out;
 	}
 
+	if (!rdma_is_port_valid(qp->device, cmd.port_num)) {
+		ret = -EINVAL;
+		goto release_qp;
+	}
+
 	attr->qp_state 		  = cmd.qp_state;
 	attr->cur_qp_state 	  = cmd.cur_qp_state;
 	attr->path_mtu 		  = cmd.path_mtu;
@@ -2397,6 +2402,7 @@ ssize_t ib_uverbs_create_ah(struct ib_uv
 			    const char __user *buf, int in_len,
 			    int out_len)
 {
+	struct ib_device		*ib_dev = file->device->ib_dev;
 	struct ib_uverbs_create_ah	 cmd;
 	struct ib_uverbs_create_ah_resp	 resp;
 	struct ib_uobject		*uobj;
@@ -2411,6 +2417,9 @@ ssize_t ib_uverbs_create_ah(struct ib_uv
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
+	if (!rdma_is_port_valid(ib_dev, cmd.attr.port_num))
+		return -EINVAL;
+
 	uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
 	if (!uobj)
 		return -ENOMEM;