* [PATCHi v2] hv_netvsc: Add check for kvmalloc_array
@ 2022-03-14 2:00 Jiasheng Jiang
0 siblings, 0 replies; only message in thread
From: Jiasheng Jiang @ 2022-03-14 2:00 UTC (permalink / raw)
To: stephen
Cc: kys, haiyangz, sthemmin, wei.liu, decui, davem, kuba, ast,
daniel, hawk, john.fastabend, andrii, kafai, songliubraving, yhs,
kpsingh, linux-hyperv, netdev, linux-kernel, bpf, Jiasheng Jiang
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>
---
Changelog:
v1 -> v2
* Change 1. Remove the unrolled zero.
---
drivers/net/hyperv/netvsc_drv.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 3646469433b1..fde1c492ca02 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -1587,6 +1587,9 @@ 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];
--
2.25.1
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