netdev - [PATCH net 1/2] netdevsim: fix memory leak in nsim_drv_probe() when nsim_dev_resources

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Date:   Thu, 20 Oct 2022 10:33:57 +0800
From:   Zhengchao Shao <shaozhengchao@...wei.com>
To:     <netdev@...r.kernel.org>, <kuba@...nel.org>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <pabeni@...hat.com>
CC:     <jiri@...lanox.com>, <weiyongjun1@...wei.com>,
        <yuehaibing@...wei.com>, <shaozhengchao@...wei.com>
Subject: [PATCH net 1/2] netdevsim: fix memory leak in nsim_drv_probe() when nsim_dev_resources_register() failed

If some items in nsim_dev_resources_register() fail, memory leak will
occur. The following is the memory leak information.

unreferenced object 0xffff888074c02600 (size 128):
  comm "echo", pid 8159, jiffies 4294945184 (age 493.530s)
  hex dump (first 32 bytes):
    40 47 ea 89 ff ff ff ff 01 00 00 00 00 00 00 00  @G..............
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
  backtrace:
    [<0000000011a31c98>] kmalloc_trace+0x22/0x60
    [<0000000027384c69>] devl_resource_register+0x144/0x4e0
    [<00000000a16db248>] nsim_drv_probe+0x37a/0x1260
    [<000000007d1f448c>] really_probe+0x20b/0xb10
    [<00000000c416848a>] __driver_probe_device+0x1b3/0x4a0
    [<00000000077e0351>] driver_probe_device+0x49/0x140
    [<0000000054f2465a>] __device_attach_driver+0x18c/0x2a0
    [<000000008538f359>] bus_for_each_drv+0x151/0x1d0
    [<0000000038e09747>] __device_attach+0x1c9/0x4e0
    [<00000000dd86e533>] bus_probe_device+0x1d5/0x280
    [<00000000839bea35>] device_add+0xae0/0x1cb0
    [<000000009c2abf46>] new_device_store+0x3b6/0x5f0
    [<00000000fb823d7f>] bus_attr_store+0x72/0xa0
    [<000000007acc4295>] sysfs_kf_write+0x106/0x160
    [<000000005f50cb4d>] kernfs_fop_write_iter+0x3a8/0x5a0
    [<0000000075eb41bf>] vfs_write+0x8f0/0xc80

Fixes: 8fb4bc6fd5bd ("netdevsim: rename devlink.c to dev.c to contain per-dev(asic) items")
Signed-off-by: Zhengchao Shao <shaozhengchao@...wei.com>
---
 drivers/net/netdevsim/dev.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
index 794fc0cc73b8..39231c5319de 100644
--- a/drivers/net/netdevsim/dev.c
+++ b/drivers/net/netdevsim/dev.c
@@ -1554,7 +1554,7 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 
 	err = nsim_dev_resources_register(devlink);
 	if (err)
-		goto err_vfc_free;
+		goto err_dl_unregister;
 
 	err = devlink_params_register(devlink, nsim_devlink_params,
 				      ARRAY_SIZE(nsim_devlink_params));
@@ -1627,7 +1627,6 @@ int nsim_drv_probe(struct nsim_bus_dev *nsim_bus_dev)
 				  ARRAY_SIZE(nsim_devlink_params));
 err_dl_unregister:
 	devl_resources_unregister(devlink);
-err_vfc_free:
 	kfree(nsim_dev->vfconfigs);
 err_devlink_unlock:
 	devl_unlock(devlink);
-- 
2.17.1