Forwarded: Re: [syzbot] [fs?] BUG: unable to handle kernel NULL pointer dereference in getname_kernel

[syzbot <syzbot+6c46a179b56c651c4c96@syzkaller.appspotmail.com>]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: Re: [syzbot] [fs?] BUG: unable to handle kernel NULL pointer dereference in getname_kernel
Author: pavankumaryalagada@gmail.com

#syz test: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux 73ae59e97596

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index d74c01c98f19..336013139ef6 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -591,6 +591,11 @@ int nvmet_ns_enable(struct nvmet_ns *ns)
        if (ns->enabled)
                goto out_unlock;
 
+       if (!ns->device_path) {
+               ret = -EINVAL;
+               goto out_unlock;
+       }
+
        ret = nvmet_bdev_ns_enable(ns);
        if (ret == -ENOTBLK)
                ret = nvmet_file_ns_enable(ns);