CVE-2021-47349 (GCVE-0-2021-47349)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2025-05-04 07:09
VLAI?
Title
mwifiex: bring down link before deleting interface
Summary
In the Linux kernel, the following vulnerability has been resolved: mwifiex: bring down link before deleting interface We can deadlock when rmmod'ing the driver or going through firmware reset, because the cfg80211_unregister_wdev() has to bring down the link for us, ... which then grab the same wiphy lock. nl80211_del_interface() already handles a very similar case, with a nice description: /* * We hold RTNL, so this is safe, without RTNL opencount cannot * reach 0, and thus the rdev cannot be deleted. * * We need to do it for the dev_close(), since that will call * the netdev notifiers, and we need to acquire the mutex there * but don't know if we get there from here or from some other * place (e.g. "ip link set ... down"). */ mutex_unlock(&rdev->wiphy.mtx); ... Do similarly for mwifiex teardown, by ensuring we bring the link down first. Sample deadlock trace: [ 247.103516] INFO: task rmmod:2119 blocked for more than 123 seconds. [ 247.110630] Not tainted 5.12.4 #5 [ 247.115796] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 247.124557] task:rmmod state:D stack: 0 pid: 2119 ppid: 2114 flags:0x00400208 [ 247.133905] Call trace: [ 247.136644] __switch_to+0x130/0x170 [ 247.140643] __schedule+0x714/0xa0c [ 247.144548] schedule_preempt_disabled+0x88/0xf4 [ 247.149714] __mutex_lock_common+0x43c/0x750 [ 247.154496] mutex_lock_nested+0x5c/0x68 [ 247.158884] cfg80211_netdev_notifier_call+0x280/0x4e0 [cfg80211] [ 247.165769] raw_notifier_call_chain+0x4c/0x78 [ 247.170742] call_netdevice_notifiers_info+0x68/0xa4 [ 247.176305] __dev_close_many+0x7c/0x138 [ 247.180693] dev_close_many+0x7c/0x10c [ 247.184893] unregister_netdevice_many+0xfc/0x654 [ 247.190158] unregister_netdevice_queue+0xb4/0xe0 [ 247.195424] _cfg80211_unregister_wdev+0xa4/0x204 [cfg80211] [ 247.201816] cfg80211_unregister_wdev+0x20/0x2c [cfg80211] [ 247.208016] mwifiex_del_virtual_intf+0xc8/0x188 [mwifiex] [ 247.214174] mwifiex_uninit_sw+0x158/0x1b0 [mwifiex] [ 247.219747] mwifiex_remove_card+0x38/0xa0 [mwifiex] [ 247.225316] mwifiex_pcie_remove+0xd0/0xe0 [mwifiex_pcie] [ 247.231451] pci_device_remove+0x50/0xe0 [ 247.235849] device_release_driver_internal+0x110/0x1b0 [ 247.241701] driver_detach+0x5c/0x9c [ 247.245704] bus_remove_driver+0x84/0xb8 [ 247.250095] driver_unregister+0x3c/0x60 [ 247.254486] pci_unregister_driver+0x2c/0x90 [ 247.259267] cleanup_module+0x18/0xcdc [mwifiex_pcie]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a05829a7222e9d10c416dd2dbbf3929fe6646b89 , < a3041d39d3c14da97fa3476835aba043ba810cf0 (git)
Affected: a05829a7222e9d10c416dd2dbbf3929fe6646b89 , < 35af69c7c0490fdccfc159c6a87e4d1dc070838a (git)
Affected: a05829a7222e9d10c416dd2dbbf3929fe6646b89 , < 1f9482aa8d412b4ba06ce6ab8e333fb8ca29a06e (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.12.18 , ≤ 5.12.* (semver)
Unaffected: 5.13.3 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
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following vulnerability has been resolved:\\n\\nmwifiex: bring down link before deleting interface\\n\\nWe can deadlock when rmmod\u0027ing the driver or going through firmware\\nreset, because the cfg80211_unregister_wdev() has to bring down the link\\nfor us, ... which then grab the same wiphy lock.\\n\\nnl80211_del_interface() already handles a very similar case, with a nice\\ndescription:\\n\\n        /*\\n         * We hold RTNL, so this is safe, without RTNL opencount cannot\\n         * reach 0, and thus the rdev cannot be deleted.\\n         *\\n         * We need to do it for the dev_close(), since that will call\\n         * the netdev notifiers, and we need to acquire the mutex there\\n         * but don\u0027t know if we get there from here or from some other\\n         * place (e.g. \\\"ip link set ... down\\\").\\n         */\\n        mutex_unlock(\u0026rdev-\u003ewiphy.mtx);\\n...\\n\\nDo similarly for mwifiex teardown, by ensuring we bring the link down\\nfirst.\\n\\nSample deadlock trace:\\n\\n[  247.103516] INFO: task rmmod:2119 blocked for more than 123 seconds.\\n[  247.110630]       Not tainted 5.12.4 #5\\n[  247.115796] \\\"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\\\" disables this message.\\n[  247.124557] task:rmmod           state:D stack:    0 pid: 2119 ppid:  2114 flags:0x00400208\\n[  247.133905] Call trace:\\n[  247.136644]  __switch_to+0x130/0x170\\n[  247.140643]  __schedule+0x714/0xa0c\\n[  247.144548]  schedule_preempt_disabled+0x88/0xf4\\n[  247.149714]  __mutex_lock_common+0x43c/0x750\\n[  247.154496]  mutex_lock_nested+0x5c/0x68\\n[  247.158884]  cfg80211_netdev_notifier_call+0x280/0x4e0 [cfg80211]\\n[  247.165769]  raw_notifier_call_chain+0x4c/0x78\\n[  247.170742]  call_netdevice_notifiers_info+0x68/0xa4\\n[  247.176305]  __dev_close_many+0x7c/0x138\\n[  247.180693]  dev_close_many+0x7c/0x10c\\n[  247.184893]  unregister_netdevice_many+0xfc/0x654\\n[  247.190158]  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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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