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nvme-pci: fix NULL pointer dereference in nvme_free_host_mem()
[ Upstream commit 7e5dd57ef3
]
Following condition which will cause NULL pointer dereference will
occur in nvme_free_host_mem() when it tries to remove pci device via
nvme_remove() especially after a failure of host memory allocation for HMB.
"(host_mem_descs == NULL) && (nr_host_mem_descs != 0)"
It's because __nr_host_mem_descs__ is not cleared to 0 unlike
__host_mem_descs__ is so.
Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1617,6 +1617,7 @@ static void nvme_free_host_mem(struct nvme_dev *dev)
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dev->nr_host_mem_descs * sizeof(*dev->host_mem_descs),
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dev->host_mem_descs, dev->host_mem_descs_dma);
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dev->host_mem_descs = NULL;
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dev->nr_host_mem_descs = 0;
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}
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static int __nvme_alloc_host_mem(struct nvme_dev *dev, u64 preferred,
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