Commit Message
Greg KH
Oct. 22, 2022, 7:24 a.m. UTC
From: Dan Carpenter <dan.carpenter@oracle.com> [ Upstream commit 939bc5453b8cbdde9f1e5110ce8309aedb1b501a ] The "hdr.count * sizeof(s32)" multiplication can overflow on 32 bit systems leading to memory corruption. Use array_size() to fix that. Fixes: 322b598be4d9 ("fpga: dfl: introduce interrupt trigger setting API") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Xu Yilun <yilun.xu@intel.com> Link: https://lore.kernel.org/r/YxBAtYCM38dM7yzI@kili Signed-off-by: Xu Yilun <yilun.xu@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/fpga/dfl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c index 6bff39ff21a0..eabaf495a481 100644 --- a/drivers/fpga/dfl.c +++ b/drivers/fpga/dfl.c @@ -1866,7 +1866,7 @@ long dfl_feature_ioctl_set_irq(struct platform_device *pdev, return -EINVAL; fds = memdup_user((void __user *)(arg + sizeof(hdr)), - hdr.count * sizeof(s32)); + array_size(hdr.count, sizeof(s32))); if (IS_ERR(fds)) return PTR_ERR(fds);