[PATCH for-next 4/9] RDMA/hns: Fix the overflow risk of hem_list_calc_ba_range()

Junxian Huang
2024-09-06T09:40:38Z

From: wenglianfa <wenglianfa@huawei.com>

The max value of 'unit' and 'hop_num' is 2^24 and 2, so the value of
'step' may exceed the range of u32. Change the type of 'step' to u64.

Fixes: 38389eaa4db1 ("RDMA/hns: Add mtr support for mixed multihop addressing")
Signed-off-by: wenglianfa <wenglianfa@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
---
drivers/infiniband/hw/hns/hns_roce_hem.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.c b/drivers/infiniband/hw/hns/hns_roce_hem.c
index 496584139240..cade3ca68de1 100644
--- a/drivers/infiniband/hw/hns/hns_roce_hem.c
+++ b/drivers/infiniband/hw/hns/hns_roce_hem.c
@@ -1041,9 +1041,9 @@ static bool hem_list_is_bottom_bt(int hopnum, int bt_level)
* @bt_level: base address table level
* @unit: ba entries per bt page
*/
-static u32 hem_list_calc_ba_range(int hopnum, int bt_level, int unit)
+static u64 hem_list_calc_ba_range(int hopnum, int bt_level, int unit)
{
- u32 step;
+ u64 step;
int max;
int i;

@@ -1079,7 +1079,7 @@ int hns_roce_hem_list_calc_root_ba(const struct hns_roce_buf_region *regions,
{
struct hns_roce_buf_region *r;
int total = 0;
- int step;
+ u64 step;
int i;

for (i = 0; i < region_cnt; i++) {
@@ -1110,7 +1110,7 @@ static int hem_list_alloc_mid_bt(struct hns_roce_dev *hr_dev,
int ret = 0;
int max_ofs;
int level;
- u32 step;
+ u64 step;
int end;

if (hopnum <= 1)
@@ -1147,7 +1147,7 @@ static int hem_list_alloc_mid_bt(struct hns_roce_dev *hr_dev,
}

start_aligned = (distance / step) * step + r->offset;
- end = min_t(int, start_aligned + step - 1, max_ofs);
+ end = min_t(u64, start_aligned + step - 1, max_ofs);
cur = hem_list_alloc_item(hr_dev, start_aligned, end, unit,
true);
if (!cur) {
@@ -1235,7 +1235,7 @@ static int setup_middle_bt(struct hns_roce_dev *hr_dev, void *cpu_base,
struct hns_roce_hem_item *hem, *temp_hem;
int total = 0;
int offset;
- int step;
+ u64 step;

step = hem_list_calc_ba_range(r->hopnum, 1, unit);
if (step < 1)
--
2.33.0