[PATCH 1/3] IB/uverbs: reject invalid or unknown opcodes

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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.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/infiniband/core/uverbs_cmd.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index a15318a..f9f3921 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2372,6 +2372,12 @@ ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
 		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) {
@@ -2413,7 +2419,8 @@ ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
 				next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
 				break;
 			default:
-				break;
+				ret = -EINVAL;
+				goto out_put;
 			}
 		}
 
-- 
1.9.1

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