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Re: [PATCH v2] xen/common: llc-coloring: Fix off-by-one in parse_color_config()
- To: Michal Orzel <michal.orzel@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 10 Apr 2026 12:56:45 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Luca Fancellu <luca.fancellu@xxxxxxx>
- Delivery-date: Fri, 10 Apr 2026 10:56:55 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.04.2026 10:29, Michal Orzel wrote:
> The check uses (*num_colors + (end - start + 1)) >= max_num_colors, which
> rejects a configuration where exactly max_num_colors colors are specified.
> For example, if max_num_colors is 4 and *num_colors is 0, a range "0-3"
> gives (end - start + 1) = 4, and (0 + 4) >= 4 is true, incorrectly
> returning -EINVAL.
>
> Fix this by switching the overflow condition to the state before commit
> cba8a584de17 that regressed the behavior (i.e. don't add 1).
>
> Fixes: cba8a584de17 ("llc-coloring: improve checking while parsing")
> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
> Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
I'm sorry for the breakage:
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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