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Thu, 08 Jan 2026 09:32:20 -0800 (PST) From: Prithvi Tambewagh To: syzbot+f6e8174215573a84b797@syzkaller.appspotmail.com, hch@lst.de, jlbec@evilplan.org Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, Prithvi Tambewagh Subject: Syzbot test for fixing recursive locking in __configfs_open_file Date: Thu, 8 Jan 2026 23:02:11 +0530 Message-Id: <20260108173211.248566-1-activprithvi@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <6767d8ea.050a0220.226966.0021.GAE@google.com> References: <6767d8ea.050a0220.226966.0021.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" #syz test upstream 3a8660878839faadb4f1a6dd72c3179c1df56787 Signed-off-by: Prithvi Tambewagh Reported-by: syzbot+f6e8174215573a84b797@syzkaller.appspotmail.com Tested-by: syzbot+f6e8174215573a84b797@syzkaller.appspotmail.com --- drivers/target/target_core_configfs.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/target/target_core_configfs.c b/drivers/target/target_= core_configfs.c index b19acd662726..f29052e6a87d 100644 --- a/drivers/target/target_core_configfs.c +++ b/drivers/target/target_core_configfs.c @@ -108,8 +108,8 @@ static ssize_t target_core_item_dbroot_store(struct con= fig_item *item, const char *page, size_t count) { ssize_t read_bytes; - struct file *fp; ssize_t r =3D -EINVAL; + struct path path =3D {}; =20 mutex_lock(&target_devices_lock); if (target_devices) { @@ -131,17 +131,18 @@ static ssize_t target_core_item_dbroot_store(struct c= onfig_item *item, db_root_stage[read_bytes - 1] =3D '\0'; =20 /* validate new db root before accepting it */ - fp =3D filp_open(db_root_stage, O_RDONLY, 0); - if (IS_ERR(fp)) { + r =3D kern_path(db_root_stage, LOOKUP_FOLLOW, &path); + if (r) { pr_err("db_root: cannot open: %s\n", db_root_stage); goto unlock; } - if (!S_ISDIR(file_inode(fp)->i_mode)) { - filp_close(fp, NULL); + if (!d_is_dir(path.dentry)) { + path_put(&path); pr_err("db_root: not a directory: %s\n", db_root_stage); + r =3D -ENOTDIR; goto unlock; } - filp_close(fp, NULL); + path_put(&path); =20 strscpy(db_root, db_root_stage); pr_debug("Target_Core_ConfigFS: db_root set to %s\n", db_root); base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787 --=20 2.34.1