RE: [PATCH v2] RDMA/rxe: check for error

[Yanjun Zhu]

In the commit log, 

ff23dfa13457 ("IB: Pass only ib_udata in function prototypes") is better than commit 'ff23dfa13457'?


-----Original Message-----
From: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx> 
Sent: Sunday, April 26, 2020 7:36 AM
To: Yanjun Zhu <yanjunz@xxxxxxxxxxxx>; Doug Ledford <dledford@xxxxxxxxxx>; Jason Gunthorpe <jgg@xxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx; Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
Subject: [PATCH v2] RDMA/rxe: check for error

The commit 'ff23dfa13457' modified rxe_create_mmap_info() to return error code and also NULL but missed fixing codes which called rxe_create_mmap_info(). Modify rxe_create_mmap_info() to only return errorcode and fix error checking after rxe_create_mmap_info() was called.

Fixes: ff23dfa13457 ("IB: Pass only ib_udata in function prototypes")
Cc: stable@xxxxxxxxxxxxxxx [5.4+]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@xxxxxxxxx>
---
 drivers/infiniband/sw/rxe/rxe_mmap.c  | 2 +-  drivers/infiniband/sw/rxe/rxe_queue.c | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/sw/rxe/rxe_mmap.c b/drivers/infiniband/sw/rxe/rxe_mmap.c
index 48f48122ddcb..6a413d73b95d 100644
--- a/drivers/infiniband/sw/rxe/rxe_mmap.c
+++ b/drivers/infiniband/sw/rxe/rxe_mmap.c
@@ -151,7 +151,7 @@ struct rxe_mmap_info *rxe_create_mmap_info(struct rxe_dev *rxe, u32 size,
 
 	ip = kmalloc(sizeof(*ip), GFP_KERNEL);
 	if (!ip)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
 
 	size = PAGE_ALIGN(size);
 
diff --git a/drivers/infiniband/sw/rxe/rxe_queue.c b/drivers/infiniband/sw/rxe/rxe_queue.c
index ff92704de32f..fef2ab5112de 100644
--- a/drivers/infiniband/sw/rxe/rxe_queue.c
+++ b/drivers/infiniband/sw/rxe/rxe_queue.c
@@ -45,8 +45,10 @@ int do_mmap_info(struct rxe_dev *rxe, struct mminfo __user *outbuf,
 
 	if (outbuf) {
 		ip = rxe_create_mmap_info(rxe, buf_size, udata, buf);
-		if (!ip)
+		if (IS_ERR(ip)) {
+			err = PTR_ERR(ip);
 			goto err1;
+		}
 
 		err = copy_to_user(outbuf, &ip->info, sizeof(ip->info));
 		if (err)
@@ -64,7 +66,7 @@ int do_mmap_info(struct rxe_dev *rxe, struct mminfo __user *outbuf,
 err2:
 	kfree(ip);
 err1:
-	return -EINVAL;
+	return err;
 }
 
 inline void rxe_queue_reset(struct rxe_queue *q)
--
2.11.0