linux-kernel - [PATCH 5.12 025/127] RDMA/uverbs: Fix a NULL vs IS

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Date:   Mon, 24 May 2021 17:25:42 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 025/127] RDMA/uverbs: Fix a NULL vs IS_ERR() bug

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 463a3f66473b58d71428a1c3ce69ea52c05440e5 ]

The uapi_get_object() function returns error pointers, it never returns
NULL.

Fixes: 149d3845f4a5 ("RDMA/uverbs: Add a method to introspect handles in a context")
Link: https://lore.kernel.org/r/YJ6Got+U7lz+3n9a@mwanda
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Reviewed-by: Leon Romanovsky <leonro@...dia.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/core/uverbs_std_types_device.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/core/uverbs_std_types_device.c b/drivers/infiniband/core/uverbs_std_types_device.c
index a03021d94e11..049684880ae0 100644
--- a/drivers/infiniband/core/uverbs_std_types_device.c
+++ b/drivers/infiniband/core/uverbs_std_types_device.c
@@ -117,8 +117,8 @@ static int UVERBS_HANDLER(UVERBS_METHOD_INFO_HANDLES)(
 		return ret;
 
 	uapi_object = uapi_get_object(attrs->ufile->device->uapi, object_id);
-	if (!uapi_object)
-		return -EINVAL;
+	if (IS_ERR(uapi_object))
+		return PTR_ERR(uapi_object);
 
 	handles = gather_objects_handle(attrs->ufile, uapi_object, attrs,
 					out_len, &total);
-- 
2.30.2