4.14-stable review patch. If anyone has any objections, please let me know.
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From: Minwoo Im minwoo.im.dev@gmail.com
[ Upstream commit 7e5dd57ef3081ff6c03908d786ed5087f6fbb7ae ]
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 --- drivers/nvme/host/pci.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1617,6 +1617,7 @@ static void nvme_free_host_mem(struct nv dev->nr_host_mem_descs * sizeof(*dev->host_mem_descs), dev->host_mem_descs, dev->host_mem_descs_dma); dev->host_mem_descs = NULL; + dev->nr_host_mem_descs = 0; }
static int __nvme_alloc_host_mem(struct nvme_dev *dev, u64 preferred,