From: Chaitanya Kulkarni chaitanya.kulkarni@wdc.com

mainline inclusion from mainline-v5.10-rc1 commit 1401fcc4e3da97c44dcc7cbf538c07e24768d791 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I956G7 CVE: CVE-2021-47074

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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The function nvme_init_ctrl() gets the ctrl reference & when it fails it does put the ctrl reference in the error unwind code.

When creating loop ctrl in nvme_loop_create_ctrl() if nvme_init_ctrl() returns non zero (i.e. error) value it jumps to the "out_put_ctrl" label which calls nvme_put_ctrl(), that will lead to douple ctrl put in error unwind path.

Update nvme_loop_create_ctrl() such that this patch removes the "out_put_ctrl" label, add a new "out" label after nvme_put_ctrl() in error unwind path and jump to newly added label when nvme_init_ctrl() call retuns an error.

Signed-off-by: Chaitanya Kulkarni chaitanya.kulkarni@wdc.com Signed-off-by: Christoph Hellwig hch@lst.de

Conflict: Commit 64d452b3560b and b6cec06d19d9 changed context. Does not affect the logic of this patch.

Signed-off-by: Li Nan linan122@huawei.com --- drivers/nvme/target/loop.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c index 1eee21310dee..985479f10597 100644 --- a/drivers/nvme/target/loop.c +++ b/drivers/nvme/target/loop.c @@ -608,7 +608,7 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, 0 /* no quirks, we're perfect! */); if (ret) - goto out_put_ctrl; + goto out;

ret = -ENOMEM;

@@ -661,8 +661,8 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, kfree(ctrl->queues); out_uninit_ctrl: nvme_uninit_ctrl(&ctrl->ctrl); -out_put_ctrl: nvme_put_ctrl(&ctrl->ctrl); +out: if (ret > 0) ret = -EIO; return ERR_PTR(ret);