Commit
44144185951a0f ("hv_netvsc: Add validation for untrusted Hyper-V
values") added validation to rndis_filter_receive_data() (and
rndis_filter_receive()) which introduced NVSP_STAT_FAIL-scenarios where
the count is not updated/reset. Fix this omission, and prevent similar
scenarios from occurring in the future.
Reported-by: Juan Vazquez <juvazq@microsoft.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Fixes: 44144185951a0f ("hv_netvsc: Add validation for untrusted Hyper-V values")
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Link: https://lore.kernel.org/r/20210203113602.558916-1-parri.andrea@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
ret = rndis_filter_receive(ndev, net_device,
nvchan, data, buflen);
- if (unlikely(ret != NVSP_STAT_SUCCESS))
+ if (unlikely(ret != NVSP_STAT_SUCCESS)) {
+ /* Drop incomplete packet */
+ nvchan->rsc.cnt = 0;
status = NVSP_STAT_FAIL;
+ }
}
enq_receive_complete(ndev, net_device, q_idx,
return ret;
drop:
- /* Drop incomplete packet */
- nvchan->rsc.cnt = 0;
return NVSP_STAT_FAIL;
}