From: Philipp Stanner <pstanner@redhat.com>
To: Wu Hao <hao.wu@intel.com>, Tom Rix <trix@redhat.com>,
Moritz Fischer <mdf@kernel.org>, Xu Yilun <yilun.xu@intel.com>
Cc: linux-fpga@vger.kernel.org, linux-kernel@vger.kernel.org,
Philipp Stanner <pstanner@redhat.com>,
Dave Airlie <airlied@redhat.com>
Subject: [PATCH] drivers/fpga: copy userspace array safely
Date: Thu, 2 Nov 2023 19:49:09 +0100 [thread overview]
Message-ID: <20231102184908.49558-2-pstanner@redhat.com> (raw)
dfl.c utilizes memdup_user() and array_size() to copy a userspace array.
Currently, this does not check for an overflow.
Use the new wrapper memdup_array_user() to copy the array more safely.
Suggested-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Philipp Stanner <pstanner@redhat.com>
---
Linus recently merged this new wrapper for Kernel v6.7
---
drivers/fpga/dfl.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index dd7a783d53b5..e69b9f1f2a50 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -2008,8 +2008,8 @@ long dfl_feature_ioctl_set_irq(struct platform_device *pdev,
(hdr.start + hdr.count < hdr.start))
return -EINVAL;
- fds = memdup_user((void __user *)(arg + sizeof(hdr)),
- array_size(hdr.count, sizeof(s32)));
+ fds = memdup_array_user((void __user *)(arg + sizeof(hdr)),
+ hdr.count, sizeof(s32));
if (IS_ERR(fds))
return PTR_ERR(fds);
--
2.41.0
next reply other threads:[~2023-11-02 18:50 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-02 18:49 Philipp Stanner [this message]
2023-11-14 7:22 ` [PATCH] drivers/fpga: copy userspace array safely Xu Yilun
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