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authorParav Pandit <parav@mellanox.com>2019-07-23 09:57:32 +0300
committerJason Gunthorpe <jgg@mellanox.com>2019-07-25 11:39:38 -0300
commita379d1ce32f1c97b19d68cffbd195e025dbb9d43 (patch)
treed5183cb08d3f6b278e8bbf840921444f71873d75 /drivers/infiniband/core
parentIB/mlx5: Prevent concurrent MR updates during invalidation (diff)
downloadlinux-dev-a379d1ce32f1c97b19d68cffbd195e025dbb9d43.tar.xz
linux-dev-a379d1ce32f1c97b19d68cffbd195e025dbb9d43.zip
IB/core: Fix querying total rdma stats
rdma_counter_init() may fail for a device. In such case while calculating total sum, ignore NULL hstats. This fixes below observed call trace. BUG: kernel NULL pointer dereference, address: 00000000000000a0 PGD 8000001009b30067 P4D 8000001009b30067 PUD 10549c9067 PMD 0 Oops: 0000 [#1] SMP PTI CPU: 55 PID: 20887 Comm: cat Kdump: loaded Not tainted 5.2.0-rc6-jdc+ #13 RIP: 0010:rdma_counter_get_hwstat_value+0xf2/0x150 [ib_core] Call Trace: show_hw_stats+0x5e/0x130 [ib_core] dev_attr_show+0x15/0x50 sysfs_kf_seq_show+0xc6/0x1a0 seq_read+0x132/0x370 vfs_read+0x89/0x140 ksys_read+0x5c/0xd0 do_syscall_64+0x5a/0x240 entry_SYSCALL_64_after_hwframe+0x49/0xbe Fixes: f34a55e497e8 ("RDMA/core: Get sum value of all counters when perform a sysfs stat read") Link: https://lore.kernel.org/r/20190723065733.4899-10-leon@kernel.org Signed-off-by: Parav Pandit <parav@mellanox.com> Reviewed-by: Mark Zhang <markz@mellanox.com> Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Diffstat (limited to 'drivers/infiniband/core')
-rw-r--r--drivers/infiniband/core/counters.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/infiniband/core/counters.c b/drivers/infiniband/core/counters.c
index 01faef7bc061..c7d445635476 100644
--- a/drivers/infiniband/core/counters.c
+++ b/drivers/infiniband/core/counters.c
@@ -393,6 +393,9 @@ u64 rdma_counter_get_hwstat_value(struct ib_device *dev, u8 port, u32 index)
u64 sum;
port_counter = &dev->port_data[port].port_counter;
+ if (!port_counter->hstats)
+ return 0;
+
sum = get_running_counters_hwstat_sum(dev, port, index);
sum += port_counter->hstats->value[index];