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Re: [PATCH] unlzma: avoid UB shift
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 30 Mar 2026 12:30:13 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Kamil Frankowicz <kamil.frankowicz@xxxxxxx>
- Delivery-date: Mon, 30 Mar 2026 11:30:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24/03/2026 3:26 pm, Jan Beulich wrote:
> Shifting signed quantities has restrictions. Since the wrapping macro of
> read_int() type-casts the result anyway, switch function return type as
> well as the local variable to the corresponding unsigned type.
>
> Reported-by: Kamil Frankowicz <kamil.frankowicz@xxxxxxx>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
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