linux-kernel - [PATCH] ksmbd: replace usage of found with dedicated list iterator variable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20220324071301.60228-1-jakobkoschel@gmail.com>
Date:   Thu, 24 Mar 2022 08:13:01 +0100
From:   Jakob Koschel <jakobkoschel@...il.com>
To:     Namjae Jeon <linkinjeon@...nel.org>
Cc:     Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steve French <sfrench@...ba.org>,
        Hyunchul Lee <hyc.lee@...il.com>, linux-cifs@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...nel.org>,
        "Brian Johannesmeyer" <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>, Jakob Koschel <jakobkoschel@...il.com>
Subject: [PATCH] ksmbd: replace usage of found with dedicated list iterator variable

To move the list iterator variable into the list_for_each_entry_*()
macro in the future it should be avoided to use the list iterator
variable after the loop body.

To *never* use the list iterator variable after the loop it was
concluded to use a separate iterator variable instead of a
found boolean [1].

This removes the need to use a found variable and simply checking if
the variable was set, can determine if the break/goto was hit.

Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/
Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
---
 fs/ksmbd/smb2pdu.c | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/fs/ksmbd/smb2pdu.c b/fs/ksmbd/smb2pdu.c
index 67e8e28e3fc3..be9606b9a944 100644
--- a/fs/ksmbd/smb2pdu.c
+++ b/fs/ksmbd/smb2pdu.c
@@ -6618,8 +6618,7 @@ int smb2_cancel(struct ksmbd_work *work)
 	struct ksmbd_conn *conn = work->conn;
 	struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
 	struct smb2_hdr *chdr;
-	struct ksmbd_work *cancel_work = NULL;
-	int canceled = 0;
+	struct ksmbd_work *cancel_work = NULL, *iter;
 	struct list_head *command_list;
 
 	ksmbd_debug(SMB, "smb2 cancel called on mid %llu, async flags 0x%x\n",
@@ -6629,11 +6628,11 @@ int smb2_cancel(struct ksmbd_work *work)
 		command_list = &conn->async_requests;
 
 		spin_lock(&conn->request_lock);
-		list_for_each_entry(cancel_work, command_list,
+		list_for_each_entry(iter, command_list,
 				    async_request_entry) {
-			chdr = smb2_get_msg(cancel_work->request_buf);
+			chdr = smb2_get_msg(iter->request_buf);
 
-			if (cancel_work->async_id !=
+			if (iter->async_id !=
 			    le64_to_cpu(hdr->Id.AsyncId))
 				continue;
 
@@ -6641,7 +6640,7 @@ int smb2_cancel(struct ksmbd_work *work)
 				    "smb2 with AsyncId %llu cancelled command = 0x%x\n",
 				    le64_to_cpu(hdr->Id.AsyncId),
 				    le16_to_cpu(chdr->Command));
-			canceled = 1;
+			cancel_work = iter;
 			break;
 		}
 		spin_unlock(&conn->request_lock);
@@ -6649,24 +6648,24 @@ int smb2_cancel(struct ksmbd_work *work)
 		command_list = &conn->requests;
 
 		spin_lock(&conn->request_lock);
-		list_for_each_entry(cancel_work, command_list, request_entry) {
-			chdr = smb2_get_msg(cancel_work->request_buf);
+		list_for_each_entry(iter, command_list, request_entry) {
+			chdr = smb2_get_msg(iter->request_buf);
 
 			if (chdr->MessageId != hdr->MessageId ||
-			    cancel_work == work)
+			    iter == work)
 				continue;
 
 			ksmbd_debug(SMB,
 				    "smb2 with mid %llu cancelled command = 0x%x\n",
 				    le64_to_cpu(hdr->MessageId),
 				    le16_to_cpu(chdr->Command));
-			canceled = 1;
+			cancel_work = iter;
 			break;
 		}
 		spin_unlock(&conn->request_lock);
 	}
 
-	if (canceled) {
+	if (cancel_work) {
 		cancel_work->state = KSMBD_WORK_CANCELLED;
 		if (cancel_work->cancel_fn)
 			cancel_work->cancel_fn(cancel_work->cancel_argv);

base-commit: f443e374ae131c168a065ea1748feac6b2e76613
-- 
2.25.1