From: Leon Romanovsky <leonro@mellanox.com>
Date: Wed, 21 Feb 2018 18:12:38 +0200
Subject: RDMA/uverbs: Properly check command supported mask
Patch-mainline: v4.17-rc1
Git-commit: eb455e329bf65c75372da65a6a268c519f489183
References: bsc#1103992 FATE#326009

The check based on index is not sufficient because

  IB_USER_VERBS_EX_CMD_CREATE_CQ = IB_USER_VERBS_CMD_CREATE_CQ

and IB_USER_VERBS_CMD_CREATE_CQ <= IB_USER_VERBS_CMD_OPEN_QP,
so if we execute IB_USER_VERBS_EX_CMD_CREATE_CQ this code checks
ib_dev->uverbs_cmd_mask not ib_dev->uverbs_ex_cmd_mask.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/core/uverbs_main.c |   18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -635,19 +635,13 @@ err_put_refs:
 	return filp;
 }
 
-static bool verify_command_mask(struct ib_device *ib_dev, __u32 command)
+static bool verify_command_mask(struct ib_device *ib_dev,
+				__u32 command, bool extended)
 {
-	u64 mask;
+	if (!extended)
+		return ib_dev->uverbs_cmd_mask & BIT_ULL(command);
 
-	if (command <= IB_USER_VERBS_CMD_OPEN_QP)
-		mask = ib_dev->uverbs_cmd_mask;
-	else
-		mask = ib_dev->uverbs_ex_cmd_mask;
-
-	if (mask & ((u64)1 << command))
-		return true;
-
-	return false;
+	return ib_dev->uverbs_ex_cmd_mask & BIT_ULL(command);
 }
 
 static bool verify_command_idx(u32 command, bool extended)
@@ -722,7 +716,7 @@ static ssize_t ib_uverbs_write(struct fi
 		goto out;
 	}
 
-	if (!verify_command_mask(ib_dev, command)) {
+	if (!verify_command_mask(ib_dev, command, extended)) {
 		ret = -EOPNOTSUPP;
 		goto out;
 	}