This is a note to let you know that I've just added the patch titled hv_netvsc: Add check for kvmalloc_array to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: hv_netvsc-add-check-for-kvmalloc_array.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 55f5b3ace0e5fa80e13e27d066b879982ffb547d Author: Jiasheng Jiang <jiasheng@xxxxxxxxxxx> Date: Mon Mar 14 10:01:25 2022 +0800 hv_netvsc: Add check for kvmalloc_array [ Upstream commit 886e44c9298a6b428ae046e2fa092ca52e822e6a ] As the potential failure of the kvmalloc_array(), it should be better to check and restore the 'data' if fails in order to avoid the dereference of the NULL pointer. Fixes: 6ae746711263 ("hv_netvsc: Add per-cpu ethtool stats for netvsc") Signed-off-by: Jiasheng Jiang <jiasheng@xxxxxxxxxxx> Link: https://lore.kernel.org/r/20220314020125.2365084-1-jiasheng@xxxxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 2dff0e110c6f..f094e4bc2175 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -1454,6 +1454,9 @@ static void netvsc_get_ethtool_stats(struct net_device *dev, pcpu_sum = kvmalloc_array(num_possible_cpus(), sizeof(struct netvsc_ethtool_pcpu_stats), GFP_KERNEL); + if (!pcpu_sum) + return; + netvsc_get_pcpu_stats(dev, pcpu_sum); for_each_present_cpu(cpu) { struct netvsc_ethtool_pcpu_stats *this_sum = &pcpu_sum[cpu];