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Removed goto and used return. #688

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Results are same. But, more convenient.

Results are same. But, more convenient.
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Hi @shaswata56!

Thanks for your contribution to the Linux kernel!

Linux kernel development happens on mailing lists, rather than on GitHub - this GitHub repository is a read-only mirror that isn't used for accepting contributions. So that your change can become part of Linux, please email it to us as a patch.

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@hbina
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hbina commented Jun 8, 2019

Hi, this is a perfectly fine commit. Please consider following the instruction on how to make contributions.

Linux kernel development happens on mailing lists, rather than on GitHub - this GitHub repository is a read-only mirror that isn't used for accepting contributions. So that your change can become part of Linux, please email it to us as a patch.

It is relatively easy to follow : https://kernelnewbies.org/FirstKernelPatch

@shaswata56
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Thank you. I'll try to send the patch asap..

idosch added a commit to idosch/linux that referenced this pull request Oct 31, 2019
Commit da58f90 ("netdevsim: Add devlink-trap support") added
delayed work to netdevsim that periodically iterates over the registered
netdevsim ports and reports various packet traps via devlink.

While the delayed work takes the 'port_list_lock' mutex to protect
against concurrent addition / deletion of ports, during devlink reload
ports are added / deleted without this lock, which can result in a
use-after-free [1].

Fix this by making sure that the ports list is always modified under the
lock.

[1]
[   62.159614] ==================================================================
[   62.161744] BUG: KASAN: use-after-free in nsim_dev_trap_report_work+0xa5e/0xad0
[   62.164125] Read of size 8 at addr ffff8881f2631d98 by task kworker/0:1/12
[   62.166208]
[   62.166706] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.4.0-rc3-custom-01423-gd86784fe9b03-dirty torvalds#688
[   62.169588] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-2.fc30 04/01/2014
[   62.171150] Workqueue: events nsim_dev_trap_report_work
[   62.171938] Call Trace:
[   62.172399]  dump_stack+0xa9/0x10e
[   62.173017]  print_address_description.constprop.0+0x21/0x2c0
[   62.174037]  __kasan_report.cold+0x75/0x9c
[   62.174783]  ? nsim_dev_trap_report_work+0xa5e/0xad0
[   62.175673]  kasan_report+0xe/0x20
[   62.176298]  nsim_dev_trap_report_work+0xa5e/0xad0
[   62.177159]  ? rcu_read_lock_sched_held+0xaf/0xe0
[   62.178005]  ? trace_event_raw_event_rcu_quiescent_state_report+0x370/0x370
[   62.179239]  process_one_work+0x9b3/0x1680
[   62.179983]  ? pwq_dec_nr_in_flight+0x330/0x330
[   62.180807]  worker_thread+0x9e/0xf00
[   62.181483]  ? __kthread_parkme+0x60/0x1b0
[   62.182217]  ? __kthread_parkme+0xf9/0x1b0
[   62.182961]  ? process_one_work+0x1680/0x1680
[   62.183940]  kthread+0x351/0x420
[   62.184541]  ? __kthread_queue_delayed_work+0x230/0x230
[   62.185473]  ret_from_fork+0x3a/0x50
[   62.186101]
[   62.186296] Allocated by task 256:
[   62.186795]  save_stack+0x1b/0x80
[   62.187335]  __kasan_kmalloc.constprop.0+0xc2/0xd0
[   62.187929]  __nsim_dev_port_add+0xa6/0x5a0
[   62.188510]  nsim_dev_port_add_all+0x45/0x100
[   62.189090]  nsim_dev_reload_up+0x42e/0x590
[   62.189865]  devlink_reload+0x232/0x370
[   62.190694]  devlink_nl_cmd_reload+0x539/0x630
[   62.191564]  genl_rcv_msg+0x5ce/0xd60
[   62.192229]  netlink_rcv_skb+0x13e/0x3a0
[   62.192940]  genl_rcv+0x29/0x40
[   62.193523]  netlink_unicast+0x47a/0x680
[   62.194239]  netlink_sendmsg+0x74e/0xc90
[   62.194974]  __sys_sendto+0x393/0x3e0
[   62.195692]  __x64_sys_sendto+0xe2/0x1b0
[   62.196444]  do_syscall_64+0xa4/0x4f0
[   62.197116]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   62.198022]
[   62.198317] Freed by task 261:
[   62.198880]  save_stack+0x1b/0x80
[   62.199495]  __kasan_slab_free+0x12c/0x170
[   62.200237]  kfree+0xdb/0x3c0
[   62.200790]  nsim_dev_reload_destroy+0xad/0x1a0
[   62.201616]  nsim_dev_reload_down+0x79/0xf0
[   62.202380]  devlink_reload+0x7d/0x370
[   62.203089]  devlink_nl_cmd_reload+0x539/0x630
[   62.203962]  genl_rcv_msg+0x5ce/0xd60
[   62.204693]  netlink_rcv_skb+0x13e/0x3a0
[   62.205433]  genl_rcv+0x29/0x40
[   62.206031]  netlink_unicast+0x47a/0x680
[   62.206760]  netlink_sendmsg+0x74e/0xc90
[   62.207532]  __sys_sendto+0x393/0x3e0
[   62.208487]  __x64_sys_sendto+0xe2/0x1b0
[   62.209160]  do_syscall_64+0xa4/0x4f0
[   62.209731]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   62.210498]
[   62.210740] The buggy address belongs to the object at ffff8881f2631c00
[   62.210740]  which belongs to the cache kmalloc-512 of size 512
[   62.212632] The buggy address is located 408 bytes inside of
[   62.212632]  512-byte region [ffff8881f2631c00, ffff8881f2631e00)
[   62.214671] The buggy address belongs to the page:
[   62.215527] page:ffffea0007c98c00 refcount:1 mapcount:0 mapping:ffff8881f5c02000 index:0x0 compound_mapcount: 0
[   62.217303] flags: 0x200000000010200(slab|head)
[   62.218255] raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881f5c02000
[   62.219773] raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
[   62.221204] page dumped because: kasan: bad access detected
[   62.222372]
[   62.222670] Memory state around the buggy address:
[   62.223536]  ffff8881f2631c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   62.224709]  ffff8881f2631d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   62.225843] >ffff8881f2631d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   62.226971]                             ^
[   62.227616]  ffff8881f2631e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   62.228758]  ffff8881f2631e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   62.229883] ==================================================================

Fixes: da58f90 ("netdevsim: Add devlink-trap support")
Signed-off-by: Ido Schimmel <[email protected]>
Reported-by: [email protected]
fengguang pushed a commit to 0day-ci/linux that referenced this pull request Feb 12, 2021
Convert S_<FOO> permissions to the more readable octal.

Link: https://lore.kernel.org/lkml/CA+55aFw5v23T-zvDZp-MmD_EYxF8WbafwwB59934FV7g21uMGQ@mail.gmail.com/

Done using:
$ git ls-files -- drivers/gpu/drm/*.[ch] |
  xargs ./scripts/checkpatch.pl -f --fix-inplace --types=SYMBOLIC_PERMS

No difference in generated .o files allyesconfig x86-64

The files below were not compiled for x86-64:

drivers/gpu/drm/msm/adreno/a5xx_debugfs.c
drivers/gpu/drm/msm/msm_debugfs.c
drivers/gpu/drm/msm/msm_perf.c
drivers/gpu/drm/msm/msm_rd.c
drivers/gpu/drm/sti/sti_drv.c

checkpatch does report several places where permissions perhaps could
be downgraded.  None of these locations are modified by this patch.

WARNING:EXPORTED_WORLD_WRITABLE: Exporting world writable files is usually an error. Consider more restrictive permissions.
torvalds#165: FILE: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:1146:
+	debugfs_create_file("ras_ctrl", 0666, con->dir,

ERROR:EXPORTED_WORLD_WRITABLE: Exporting writable files is usually an error. Consider more restrictive permissions.
torvalds#165: FILE: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:1146:
+	debugfs_create_file("ras_ctrl", 0666, con->dir,
 				adev, &amdgpu_ras_debugfs_ctrl_ops);
WARNING:EXPORTED_WORLD_WRITABLE: Exporting world writable files is usually an error. Consider more restrictive permissions.
torvalds#168: FILE: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:1148:
+	debugfs_create_file("ras_eeprom_reset", 0666, con->dir,

ERROR:EXPORTED_WORLD_WRITABLE: Exporting writable files is usually an error. Consider more restrictive permissions.
torvalds#168: FILE: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:1148:
+	debugfs_create_file("ras_eeprom_reset", 0666, con->dir,
 				adev, &amdgpu_ras_debugfs_eeprom_ops);
WARNING:EXPORTED_WORLD_WRITABLE: Exporting world writable files is usually an error. Consider more restrictive permissions.
torvalds#177: FILE: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:1159:
+	debugfs_create_bool("auto_reboot", 0666, con->dir,

ERROR:EXPORTED_WORLD_WRITABLE: Exporting writable files is usually an error. Consider more restrictive permissions.
torvalds#177: FILE: drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c:1159:
+	debugfs_create_bool("auto_reboot", 0666, con->dir,
 				&con->reboot);

WARNING:EXPORTED_WORLD_WRITABLE: Exporting world writable files is usually an error. Consider more restrictive permissions.
torvalds#688: FILE: drivers/gpu/drm/msm/adreno/a5xx_debugfs.c:157:
+	debugfs_create_file("reset", 0222, minor->debugfs_root, dev,

ERROR:EXPORTED_WORLD_WRITABLE: Exporting writable files is usually an error. Consider more restrictive permissions.
torvalds#688: FILE: drivers/gpu/drm/msm/adreno/a5xx_debugfs.c:157:
+	debugfs_create_file("reset", 0222, minor->debugfs_root, dev,
 			    &reset_fops);

Signed-off-by: Joe Perches <[email protected]>
ojeda added a commit to ojeda/linux that referenced this pull request Feb 28, 2022
kbuild: canonicalization of target path not needed anymore
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