[ Upstream commit c8e8c77b3bdbade6e26e8e76595f141ede12b692 ]
The Number of Namespaces (nn) field in the identify controller data structure is defined as u32 and the maximum allowed value in NVMe specification is 0xFFFFFFFEUL. This change fixes the possible overflow of the DIV_ROUND_UP() operation used in nvme_scan_ns_list() by casting the nn to u64.
Signed-off-by: Jaesoo Lee jalee@purestorage.com Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 35d2202ee2fd..3a390b2c7540 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3397,7 +3397,8 @@ static int nvme_scan_ns_list(struct nvme_ctrl *ctrl, unsigned nn) { struct nvme_ns *ns; __le32 *ns_list; - unsigned i, j, nsid, prev = 0, num_lists = DIV_ROUND_UP(nn, 1024); + unsigned i, j, nsid, prev = 0; + unsigned num_lists = DIV_ROUND_UP_ULL((u64)nn, 1024); int ret = 0;
ns_list = kzalloc(NVME_IDENTIFY_DATA_SIZE, GFP_KERNEL);