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 b450870b75ed..eb8a6e329af9 100644 --- a/drivers/fpga/dfl.c +++ b/drivers/fpga/dfl.c @@ -1857,7 +1857,7 @@ 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);