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| author | Jiasheng Jiang <jiasheng@iscas.ac.cn> | 2022-03-14 10:01:25 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-03-23 09:13:28 +0100 |
| commit | 9b763ceda6f8963cc99df5772540c54ba46ba37c (patch) | |
| tree | 13de6597d867b8c89943e1695caa638446ece6b6 | |
| parent | 09a7264fb0d020c2ba38f283d17221cb2c31a5ab (diff) | |
| download | linux-stable-9b763ceda6f8963cc99df5772540c54ba46ba37c.tar.gz linux-stable-9b763ceda6f8963cc99df5772540c54ba46ba37c.tar.bz2 linux-stable-9b763ceda6f8963cc99df5772540c54ba46ba37c.zip | |
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@iscas.ac.cn>
Link: https://lore.kernel.org/r/20220314020125.2365084-1-jiasheng@iscas.ac.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/net/hyperv/netvsc_drv.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c index 261e6e55a907..e3676386d0ee 100644 --- a/drivers/net/hyperv/netvsc_drv.c +++ b/drivers/net/hyperv/netvsc_drv.c @@ -1562,6 +1562,9 @@ 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]; |