* [PATCH] ceph: fix off by one bugs in unsafe_request_wait()
@ 2021-09-06 9:43 Dan Carpenter
2021-09-06 18:03 ` Ilya Dryomov
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2021-09-06 9:43 UTC (permalink / raw)
To: Jeff Layton, Xiubo Li; +Cc: Ilya Dryomov, ceph-devel, kernel-janitors
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
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] ceph: fix off by one bugs in unsafe_request_wait()
2021-09-06 9:43 [PATCH] ceph: fix off by one bugs in unsafe_request_wait() Dan Carpenter
@ 2021-09-06 18:03 ` Ilya Dryomov
0 siblings, 0 replies; 2+ messages in thread
From: Ilya Dryomov @ 2021-09-06 18:03 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Jeff Layton, Xiubo Li, Ceph Development, kernel-janitors
On Mon, Sep 6, 2021 at 11:43 AM Dan Carpenter <dan.carpenter@oracle.com> wrote:
>
> 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
>
Applied.
Thanks,
Ilya
^ permalink raw reply [flat|nested] 2+ messages in thread
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