ACK: [SRU][Q/N:linux-azure][PATCH v2 0/1] azure: backport "net: hv_netvsc: reject RSS hash key programming without RX indirection table"

[Yufeng Gao]

On 8/4/26 02:31, Vinicius Peixoto wrote:
> BugLink: https://bugs.launchpad.net/bugs/2142703
>
> [Impact]
>
> RSS configuration requires a valid RX indirection table. However, if the
> network device reports only a single RX queue, an indirection table will
> not be allocated. hv_netvsc currently does not check for this and
> attempting to set the RSS hash key will hang VMs on Azure.
>
> [Fix]
>
> Backport the following fix:
>
> d23564955811 ("net: hv_netvsc: reject RSS hash key programming without RX indirection table")
>
> [Test plan]
>
> Build tested only; Azure will run reproducers on their side to validate the fix.
>
> [Where problems could occur]
>
> This is small, self-contained and has no side effects, but will change
> the behavior of the hv_netvsc module upon an invalid RSS hash key update
> operation, which could cause issues related to network packet reception
> for machines with multiple receive queues on Azure.
>
> [Other info]
> SF #00427202
>
> [Changelog]
> v1 -> v2: remove Jammy from the patchset since in that kernel the
> rx_table within struct net_device_context is statically allocated and
> accessing it inside netvsc_set_rxfh() will not cause a null pointer
> dereference.
>
> Aditya Garg (1):
>    net: hv_netvsc: reject RSS hash key programming without RX indirection
>      table
>
>   drivers/net/hyperv/netvsc_drv.c | 3 +++
>   1 file changed, 3 insertions(+)
>
Acked-by: Yufeng Gao <yufeng.gao at canonical.com>