From c8e8c77b3bdbade6e26e8e76595f141ede12b692 Mon Sep 17 00:00:00 2001 From: Jaesoo Lee Date: Mon, 3 Jun 2019 16:42:28 -0700 Subject: nvme: Fix u32 overflow in the number of namespace list calculation 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 Reviewed-by: Christoph Hellwig Signed-off-by: Sagi Grimberg --- drivers/nvme/host/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 1b7c2afd84cb..120fb593d1da 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -3400,7 +3400,8 @@ 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); -- cgit v1.2.3