[PATCH 4.1 099/159] IB/uverbs: reject invalid or unknown opcodes

Greg Kroah-Hartman
2015-09-26T21:37:46Z

From: Christoph Hellwig <hch@lst.de>

commit b632ffa7cee439ba5dce3b3bc4a5cbe2b3e20133 upstream.

We have many WR opcodes that are only supported in kernel space
and/or require optional information to be copied into the WR
structure. Reject all those not explicitly handled so that we
can't pass invalid information to drivers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/infiniband/core/uverbs_cmd.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2244,6 +2244,12 @@ ssize_t ib_uverbs_post_send(struct ib_uv
next->send_flags = user_wr->send_flags;

if (is_ud) {
+ if (next->opcode != IB_WR_SEND &&
+ next->opcode != IB_WR_SEND_WITH_IMM) {
+ ret = -EINVAL;
+ goto out_put;
+ }
+
next->wr.ud.ah = idr_read_ah(user_wr->wr.ud.ah,
file->ucontext);
if (!next->wr.ud.ah) {
@@ -2283,9 +2289,11 @@ ssize_t ib_uverbs_post_send(struct ib_uv
user_wr->wr.atomic.compare_add;
next->wr.atomic.swap = user_wr->wr.atomic.swap;
next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
+ case IB_WR_SEND:
break;
default:
- break;
+ ret = -EINVAL;
+ goto out_put;
}
}