linux-stable/drivers/cxl
Quanquan Cao d76779dd36 cxl/region:Fix overflow issue in alloc_hpa()
Creating a region with 16 memory devices caused a problem. The div_u64_rem
function, used for dividing an unsigned 64-bit number by a 32-bit one,
faced an issue when SZ_256M * p->interleave_ways. The result surpassed
the maximum limit of the 32-bit divisor (4G), leading to an overflow
and a remainder of 0.
note: At this point, p->interleave_ways is 16, meaning 16 * 256M = 4G

To fix this issue, I replaced the div_u64_rem function with div64_u64_rem
and adjusted the type of the remainder.

Signed-off-by: Quanquan Cao <caoqq@fujitsu.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Fixes: 23a22cd1c9 ("cxl/region: Allocate HPA capacity to regions")
Cc: <stable@vger.kernel.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2024-01-24 21:03:03 -08:00
..
core cxl/region:Fix overflow issue in alloc_hpa() 2024-01-24 21:03:03 -08:00
acpi.c cxl: Convert find_cxl_root() to return a 'struct cxl_root *' 2024-01-05 14:36:29 -08:00
cxl.h Merge branch 'for-6.7/cxl' into for-6.8/cxl 2024-01-05 19:24:33 -08:00
cxlmem.h Merge branch 'for-6.8/cxl-cper' into for-6.8/cxl 2024-01-09 19:21:44 -08:00
cxlpci.h cxl: Calculate and store PCI link latency for the downstream ports 2023-12-22 14:53:49 -08:00
Kconfig cxl: Add callback to parse the DSMAS subtables from CDAT 2023-12-22 14:33:10 -08:00
Makefile cxl/pmem: Introduce nvdimm_security_ops with ->get_flags() operation 2022-11-30 16:30:47 -08:00
mem.c cxl: Export sysfs attributes for memory device QoS class 2023-12-22 15:46:02 -08:00
pci.c cxl/pci: Skip irq features if MSI/MSI-X are not supported 2024-01-22 10:42:00 -08:00
pmem.c cxl/mbox: Move mailbox related driver state to its own data structure 2023-06-25 14:31:08 -07:00
pmu.h cxl/pci: Find and register CXL PMU devices 2023-05-30 11:20:35 -07:00
port.c cxl: Refactor to use __free() for cxl_root allocation in cxl_endpoint_port_probe() 2024-01-05 14:36:29 -08:00
security.c Merge branch 'for-6.5/cxl-type-2' into for-6.5/cxl 2023-06-25 17:16:51 -07:00