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([2405:201:c052:b00b:4b36:fe93:5f92:db19]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39b260cd2aasm27319660a91.3.2026.09.08.12.35.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Sep 2026 12:35:08 -0700 (PDT) From: pavankumaryalagada@gmail.com To: hch@lst.de, sagi@grimberg.me Cc: kch@nvidia.com, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, Yalagada Pavan Kumar , syzbot+6c46a179b56c651c4c96@syzkaller.appspotmail.com Subject: [PATCH] nvmet: validate device_path before enabling namespace Date: Wed, 9 Sep 2026 01:04:52 +0530 Message-ID: <20260908193452.53347-1-pavankumaryalagada@gmail.com> X-Mailer: git-send-email 2.43.0 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" From: Yalagada Pavan Kumar When buffered_io is enabled, nvmet_bdev_ns_enable() returns -ENOTBLK without checking whether device_path is configured. nvmet_ns_enable() then falls back to nvmet_file_ns_enable(), which passes the NULL device_path to filp_open() and causes a NULL pointer dereference. Validate device_path before attempting to enable to namespace and return -EINVAL when it has not been configured. Fixes: 6f6d604b4ef8 ("nvmet: allow bdev in buffered_io mode") Reported-by: syzbot+6c46a179b56c651c4c96@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D6c46a179b56c651c4c96 Tested-by: syzbot+6c46a179b56c651c4c96@syzkaller.appspotmail.com Signed-off-by: Yalagada Pavan Kumar --- drivers/nvme/target/core.c | 5 +++++ 1 file changed, 5 insertions(+) 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; =20 + if (!ns->device_path) { + ret =3D -EINVAL; + goto out_unlock; + } + ret =3D nvmet_bdev_ns_enable(ns); if (ret =3D=3D -ENOTBLK) ret =3D nvmet_file_ns_enable(ns); --=20 2.43.0