Re: [PATCH v2] rust: net: netlink: validate attribute length before casting to `c_int`

[Alice Ryhl]

On Tue, Sep 15, 2026 at 04:40:10PM +0000, Sagar Taunk wrote:
> `put()` trusted an unchecked `as` cast from `usize` to `c_int`.
> When the length exceeds `i32::MAX` that cast wraps around to a
> negative value.
> 
> This ultimately resulted in a kernel panic when the reinterpreted
> value via `__nla_reserve()` and `skb_put()` became enormous.
> 
> Validate payload and header both fit together in a `u16`, rejecting
> any payload that wouldn't leave room for `NLA_HDRLEN`.
> 
> Signed-off-by: Sagar Taunk <sagartaunk@xxxxxxxxx>

This should include a Fixes: tag if it leads to a kernel panic.

Can you also update the subject to [PATCH net vX] according to the
guidelines in: Documentation/process/maintainer-netdev.rst

The patch itself LGTM.
Reviewed-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>

Alice