ACK: [SRU][Mantic][Jammy][Focal][PATCH 0/1] CVE-2023-46838

[Stefan Bader]

On 13.02.24 19:09, Bethany Jamison wrote:
> [Impact]
> 
> Transmit requests in Xen's virtual network protocol can consist of multiple
> parts. While not really useful, except for the initial part any of them may
> be of zero length, i.e. carry no data at all. Besides a certain initial
> portion of the to be transferred data, these parts are directly translated
> into what Linux calls SKB fragments. Such converted request parts can, when
> for a particular SKB they are all of length zero, lead to a de-reference of
> NULL in core networking code.
> 
> [Fix]
> 
> Mantic: Clean cherry-pick.
> Jammy: Mantic patch applied cleanly.
> Focal: Mantic patch applied cleanly.
> 
> [Test Case]
> 
> Compile and boot tested.
> 
> [Regression Potential]
> 
> Issues could occur when sending data through Xen's networking especially
> when any of those segments are zeroed.
> 
> Jan Beulich (1):
>    xen-netback: don't produce zero-size SKB frags
> 
>   drivers/net/xen-netback/netback.c | 44 ++++++++++++++++++++++++++-----
>   1 file changed, 38 insertions(+), 6 deletions(-)
> 

Acked-by: Stefan Bader <stefan.bader at canonical.com>
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