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

[John Cabaj]

On 4/7/26 11:31 AM, Vinicius Peixoto wrote:
> BugLink: https://bugs.launchpad.net/bugs/2142703

If Jammy isn't affected, by sure to indicate we aren't fixing that 
release in the LP bug

Acked-by: John Cabaj <john.cabaj at canonical.com>

> 
> [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(+)
>