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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: 37923ed6b8 ("netdevsim: Add simple FIB resource controller via devlink")
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Zhengchao Shao 2022-10-26 09:46:41 +08:00 committed by Jakub Kicinski
parent cf2010aa1c
commit 6b1da9f712
1 changed files with 13 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/net/netdevsim/dev.c
View File

@ -442,7 +442,7 @@ static int nsim_dev_resources_register(struct devlink *devlink)
&params);
if (err) {
pr_err("Failed to register IPv4 top resource\n");
goto out;
goto err_out;
}
err = devl_resource_register(devlink, "fib", (u64)-1,
@ -450,7 +450,7 @@ static int nsim_dev_resources_register(struct devlink *devlink)
NSIM_RESOURCE_IPV4, &params);
if (err) {
pr_err("Failed to register IPv4 FIB resource\n");
return err;
goto err_out;
}
err = devl_resource_register(devlink, "fib-rules", (u64)-1,
@ -458,7 +458,7 @@ static int nsim_dev_resources_register(struct devlink *devlink)
NSIM_RESOURCE_IPV4, &params);
if (err) {
pr_err("Failed to register IPv4 FIB rules resource\n");
return err;
goto err_out;
}
/* Resources for IPv6 */
@ -468,7 +468,7 @@ static int nsim_dev_resources_register(struct devlink *devlink)
&params);
if (err) {
pr_err("Failed to register IPv6 top resource\n");
goto out;
goto err_out;
}
err = devl_resource_register(devlink, "fib", (u64)-1,
@ -476,7 +476,7 @@ static int nsim_dev_resources_register(struct devlink *devlink)
NSIM_RESOURCE_IPV6, &params);
if (err) {
pr_err("Failed to register IPv6 FIB resource\n");
return err;
goto err_out;
}
err = devl_resource_register(devlink, "fib-rules", (u64)-1,
@ -484,7 +484,7 @@ static int nsim_dev_resources_register(struct devlink *devlink)
NSIM_RESOURCE_IPV6, &params);
if (err) {
pr_err("Failed to register IPv6 FIB rules resource\n");
return err;
goto err_out;
}
/* Resources for nexthops */
@ -492,8 +492,14 @@ static int nsim_dev_resources_register(struct devlink *devlink)
NSIM_RESOURCE_NEXTHOPS,
DEVLINK_RESOURCE_ID_PARENT_TOP,
&params);
if (err) {
pr_err("Failed to register NEXTHOPS resource\n");
goto err_out;
}
return 0;
out:
err_out:
devl_resources_unregister(devlink);
return err;
}