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charset=\"utf-8\"","Content-Transfer-Encoding":"base64","Errors-To":"kernel-team-bounces@lists.ubuntu.com","Sender":"\"kernel-team\" "},"content":"BugLink: https://bugs.launchpad.net/bugs/2142703\n\n[Impact]\n\nRSS configuration requires a valid RX indirection table. However, if the\nnetwork device reports only a single RX queue, an indirection table will\nnot be allocated. hv_netvsc currently does not check for this and\nattempting to set the RSS hash key will hang VMs on Azure.\n\n[Fix]\n\nBackport the following fix:\n\nd23564955811 (\"net: hv_netvsc: reject RSS hash key programming without RX indirection table\")\n\n[Test plan]\n\nBuild tested only; Azure will run reproducers on their side to validate the fix.\n\n[Where problems could occur]\n\nThis is small, self-contained and has no side effects, but will change\nthe behavior of the hv_netvsc module upon an invalid RSS hash key update\noperation, which could cause issues related to network packet reception\nfor machines with multiple receive queues on Azure.\n\n[Other info]\nSF #00427202\n\n[Changelog]\nv1 -> v2: remove Jammy from the patchset since in that kernel the\nrx_table within struct net_device_context is statically allocated and\naccessing it inside netvsc_set_rxfh() will not cause a null pointer\ndereference.\n\nAditya Garg (1):\n net: hv_netvsc: reject RSS hash key programming without RX indirection\n table\n\n drivers/net/hyperv/netvsc_drv.c | 3 +++\n 1 file changed, 3 insertions(+)"}