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fpga: prevent integer overflow in dfl_feature_ioctl_set_irq()

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[ Upstream commit 939bc5453b ]

The "hdr.count * sizeof(s32)" multiplication can overflow on 32 bit
systems leading to memory corruption.  Use array_size() to fix that.

Fixes: 322b598be4 ("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>
This commit is contained in:
Dan Carpenter 2022-09-01 08:18:45 +03:00 committed by Greg Kroah-Hartman
parent 843433a02e
commit 1b5a931594
1 changed files with 1 additions and 1 deletions
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2
drivers/fpga/dfl.c
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@ -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);