From mboxrd@z Thu Jan  1 00:00:00 1970
From: Claude Code Review Bot <claude-review@example.com>
To: dri-devel-reviews@example.com
Subject: Claude review: gpu: nova-core: vbios: use checked accesses in `setup_falcon_data`
Date: Thu, 23 Apr 2026 08:42:24 +1000
Message-ID: <review-patch5-20260421-fix-vbios-v3-5-8f648aef7a85@nvidia.com>
In-Reply-To: <20260421-fix-vbios-v3-5-8f648aef7a85@nvidia.com>
References: <20260421-fix-vbios-v3-0-8f648aef7a85@nvidia.com> <20260421-fix-vbios-v3-5-8f648aef7a85@nvidia.com>
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Patch Review

Good fix. The old code:
```rust
let mut ucode_offset = usize::from_safe_cast(entry.data);
ucode_offset -= pci_at_image.base.data.len();
// check and subtract...
ucode_offset -= first_fwsec.base.data.len();
```

could panic on the subtractions if the firmware-supplied `entry.data` was smaller than expected. The new code chains `checked_sub` calls and returns `EINVAL` on underflow.

No issues.

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