RDMA/uverbs: Check port number supplied by user verbs cmds

BugLink: http://bugs.launchpad.net/bugs/1705238
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")
Cc: Yevgeny Kliteynik <kliteyn@mellanox.com>
Cc: Tziporet Koren <tziporet@mellanox.com>
Cc: Alex Polak <alexpo@mellanox.com>
Signed-off-by: Boris Pismenny <borisp@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 1c02deab068fbf1031d5b21db960feb9b06865c5..9eca4b41fa0ad080ca25c73e17afd7fe2634a1e1 100644 (file)
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2287,6 +2287,10 @@ ssize_t ib_uverbs_modify_qp(struct ib_uverbs_file *file,
        if (copy_from_user(&cmd, buf, sizeof cmd))
                return -EFAULT;
 
+       if (cmd.port_num < rdma_start_port(ib_dev) ||
+           cmd.port_num > rdma_end_port(ib_dev))
+               return -EINVAL;
+
        INIT_UDATA(&udata, buf + sizeof cmd, NULL, in_len - sizeof cmd,
                   out_len);
 
@@ -2827,6 +2831,10 @@ ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
        if (copy_from_user(&cmd, buf, sizeof cmd))
                return -EFAULT;
 
+       if (cmd.attr.port_num < rdma_start_port(ib_dev) ||
+           cmd.attr.port_num > rdma_end_port(ib_dev))
+               return -EINVAL;
+
        uobj = kmalloc(sizeof *uobj, GFP_KERNEL);
        if (!uobj)
                return -ENOMEM;