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authorPhilipp Stanner <pstanner@redhat.com>2023-11-14 12:19:02 +0100
committerXu Yilun <yilun.xu@linux.intel.com>2023-11-17 16:34:26 +0800
commit5496fb8eedd637e1e9d87655f86dc816afd5ad68 (patch)
tree7d7fe0b1aeaccd5f7e0e0130366e520e92ef3abc /drivers
parentb85ea95d086471afb4ad062012a4d73cd328fa86 (diff)
drivers/fpga: use standard array-copy function
dfl.c utilizes memdup_user() and array_size() to copy a userspace array. array_size() will likely never trigger thanks to the preceding check. Nevertheless, in the theoretical event that it would, it would return SIZE_MAX to memdup_user(), resulting in an attempt to allocate huge amounts of memory. string.h from the core-api now provides memdup_array_user() which also performs an overflow check and returns an error-pointer with -EOVERFLOW to the caller. As an additional advantage it standardizes how userspace-arrays are being copied and, thus, makes it more obvious to readers that an array is being copied. Replace memdup_user() with memdup_array_user(). Suggested-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Philipp Stanner <pstanner@redhat.com> Acked-by: Xu Yilun <yilun.xu@intel.com> Link: https://lore.kernel.org/r/20231114111901.19380-2-pstanner@redhat.com Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/fpga/dfl.c4
1 files 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);