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nvme: Fix u32 overflow in the number of namespace list calculation

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[ 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>
This commit is contained in:
Jaesoo Lee 2019-06-03 16:42:28 -07:00 committed by Greg Kroah-Hartman
parent 8953143e35
commit 74c0cf1368
1 changed files with 2 additions and 1 deletions
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3
drivers/nvme/host/core.c
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@ -2477,7 +2477,8 @@ 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(0x1000, GFP_KERNEL);