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SubjectRe: [syzbot] [pm?] KASAN: use-after-free Read in netdev_unregister_kobject
Date
On Mon, 22 Apr 2024 08:35:25 -0700
> syzbot found the following issue on:
>
> HEAD commit: 3cdb45594619 Merge tag 's390-6.9-4' of git://git.kernel.or..
> git tree: upstream
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=144067cb180000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 3cdb45594619

--- x/net/bluetooth/bnep/core.c
+++ y/net/bluetooth/bnep/core.c
@@ -659,7 +659,7 @@ int bnep_del_connection(struct bnep_conn
if (req->flags & ~valid_flags)
return -EINVAL;

- down_read(&bnep_session_sem);
+ down_write(&bnep_session_sem);

s = __bnep_get_session(req->dst);
if (s) {
@@ -668,7 +668,7 @@ int bnep_del_connection(struct bnep_conn
} else
err = -ENOENT;

- up_read(&bnep_session_sem);
+ up_write(&bnep_session_sem);
return err;
}

--
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