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From: Dan Carpenter <dan.carpenter@oracle.com>
To: Jeff Layton <jlayton@kernel.org>, Xiubo Li <xiubli@redhat.com>
Cc: Ilya Dryomov <idryomov@gmail.com>,
	ceph-devel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [PATCH] ceph: fix off by one bugs in unsafe_request_wait()
Date: Mon, 6 Sep 2021 12:43:01 +0300	[thread overview]
Message-ID: <20210906094301.GB10957@kili> (raw)

The "> max" tests should be ">= max" to prevent an out of bounds access
on the next lines.

Fixes: e1a4541ec0b9 ("ceph: flush the mdlog before waiting on unsafe reqs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 fs/ceph/caps.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 26c5029629a4..ebbad9080422 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2260,7 +2260,7 @@ static int unsafe_request_wait(struct inode *inode)
 			list_for_each_entry(req, &ci->i_unsafe_dirops,
 					    r_unsafe_dir_item) {
 				s = req->r_session;
-				if (unlikely(s->s_mds > max)) {
+				if (unlikely(s->s_mds >= max)) {
 					spin_unlock(&ci->i_unsafe_lock);
 					goto retry;
 				}
@@ -2274,7 +2274,7 @@ static int unsafe_request_wait(struct inode *inode)
 			list_for_each_entry(req, &ci->i_unsafe_iops,
 					    r_unsafe_target_item) {
 				s = req->r_session;
-				if (unlikely(s->s_mds > max)) {
+				if (unlikely(s->s_mds >= max)) {
 					spin_unlock(&ci->i_unsafe_lock);
 					goto retry;
 				}
-- 
2.20.1


             reply	other threads:[~2021-09-06  9:43 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-06  9:43 Dan Carpenter [this message]
2021-09-06 18:03 ` [PATCH] ceph: fix off by one bugs in unsafe_request_wait() Ilya Dryomov

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