In the Linux kernel, the following vulnerability has been resolved:
wifi: rtw88: use ieee80211purgetx_queue() to purge TX skb
When removing kernel modules by: rmmod rtw888723cs rtw888703b rtw888723x rtw88sdio rtw88_core
Driver uses skbqueuepurge() to purge TX skb, but not report tx status causing "Have pending ack frames!" warning. Use ieee80211purgetx_queue() to correct this.
Since ieee80211purgetx_queue() doesn't take locks, to prevent racing between TX work and purge TX queue, flush and destroy TX work in advance.
wlan0: deauthenticating from aa:f5:fd:60:4c:a8 by local choice (Reason: 3=DEAUTHLEAVING) ------------[ cut here ]------------ Have pending ack frames! WARNING: CPU: 3 PID: 9232 at net/mac80211/main.c:1691 ieee80211freeackframe+0x5c/0x90 [mac80211] CPU: 3 PID: 9232 Comm: rmmod Tainted: G C 6.10.1-200.fc40.aarch64 #1 Hardware name: pine64 Pine64 PinePhone Braveheart (1.1)/Pine64 PinePhone Braveheart (1.1), BIOS 2024.01 01/01/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : ieee80211freeackframe+0x5c/0x90 [mac80211] lr : ieee80211freeackframe+0x5c/0x90 [mac80211] sp : ffff80008c1b37b0 x29: ffff80008c1b37b0 x28: ffff000003be8000 x27: 0000000000000000 x26: 0000000000000000 x25: ffff000003dc14b8 x24: ffff80008c1b37d0 x23: ffff000000ff9f80 x22: 0000000000000000 x21: 000000007fffffff x20: ffff80007c7e93d8 x19: ffff00006e66f400 x18: 0000000000000000 x17: ffff7ffffd2b3000 x16: ffff800083fc0000 x15: 0000000000000000 x14: 0000000000000000 x13: 2173656d61726620 x12: 6b636120676e6964 x11: 0000000000000000 x10: 000000000000005d x9 : ffff8000802af2b0 x8 : ffff80008c1b3430 x7 : 0000000000000001 x6 : 0000000000000001 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000003be8000 Call trace: ieee80211freeackframe+0x5c/0x90 [mac80211] idrforeach+0x74/0x110 ieee80211freehw+0x44/0xe8 [mac80211] rtwsdioremove+0x9c/0xc0 [rtw88sdio] sdiobusremove+0x44/0x180 deviceremove+0x54/0x90 devicereleasedriverinternal+0x1d4/0x238 driverdetach+0x54/0xc0 busremovedriver+0x78/0x108 driverunregister+0x38/0x78 sdiounregisterdriver+0x2c/0x40 rtw8723csdriverexit+0x18/0x1000 [rtw888723cs] _dosysdeletemodule.isra.0+0x190/0x338 _arm64sysdeletemodule+0x1c/0x30 invokesyscall+0x74/0x100 el0svccommon.constprop.0+0x48/0xf0 doel0svc+0x24/0x38 el0svc+0x3c/0x158 el0t64synchandler+0x120/0x138 el0t64_sync+0x194/0x198 ---[ end trace 0000000000000000 ]---