CVE-2024-47715

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt7915: fix oops on non-dbdc mt7986

mt7915bandconfig() sets bandidx = 1 on the main phy for mt7986 with MT7975ONEADIE or MT7976ONE_ADIE.

Commit 0335c034e726 ("wifi: mt76: fix race condition related to checking tx queue fill status") introduced a dereference of the phys array indirectly indexed by bandidx via wcid->phyidx in mt76wcidcleanup(). This caused the following Oops on affected mt7986 devices:

Unable to handle kernel read from unreadable memory at virtual address 0000000000000024 Mem abort info: ESR = 0x0000000096000005 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x05: level 1 translation fault Data abort info: ISV = 0, ISS = 0x00000005 CM = 0, WnR = 0 user pgtable: 4k pages, 39-bit VAs, pgdp=0000000042545000 [0000000000000024] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 Internal error: Oops: 0000000096000005 [#1] SMP Modules linked in: ... mt7915e mt76connaclib mt76 mac80211 cfg80211 ... CPU: 2 PID: 1631 Comm: hostapd Not tainted 5.15.150 #0 Hardware name: ZyXEL EX5700 (Telenor) (DT) pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : mt76wcidcleanup+0x84/0x22c [mt76] lr : mt76wcidcleanup+0x64/0x22c [mt76] sp : ffffffc00a803700 x29: ffffffc00a803700 x28: ffffff80008f7300 x27: ffffff80003f3c00 x26: ffffff80000a7880 x25: ffffffc008c26e00 x24: 0000000000000001 x23: ffffffc000a68114 x22: 0000000000000000 x21: ffffff8004172cc8 x20: ffffffc00a803748 x19: ffffff8004152020 x18: 0000000000000000 x17: 00000000000017c0 x16: ffffffc008ef5000 x15: 0000000000000be0 x14: ffffff8004172e28 x13: ffffff8004172e28 x12: 0000000000000000 x11: 0000000000000000 x10: ffffff8004172e30 x9 : ffffff8004172e28 x8 : 0000000000000000 x7 : ffffff8004156020 x6 : 0000000000000000 x5 : 0000000000000031 x4 : 0000000000000000 x3 : 0000000000000001 x2 : 0000000000000000 x1 : ffffff80008f7300 x0 : 0000000000000024 Call trace: mt76wcidcleanup+0x84/0x22c [mt76] _mt76staremove+0x70/0xbc [mt76] mt76stastate+0x8c/0x1a4 [mt76] mt7915eepromgetpowerdelta+0x11e4/0x23a0 [mt7915e] drvstastate+0x144/0x274 [mac80211] stainfomovestate+0x1cc/0x2a4 [mac80211] stasetsinfo+0xaf8/0xc24 [mac80211] stainfodestroyaddrbss+0x4c/0x6c [mac80211]

ieee80211colorchangefinish+0x1c08/0x1e70 [mac80211] cfg80211checkstationchange+0x1360/0x4710 [cfg80211] genlfamilyrcvmsgdoit+0xb4/0x110 genlrcvmsg+0xd0/0x1bc netlinkrcvskb+0x58/0x120 genlrcv+0x34/0x50 netlinkunicast+0x1f0/0x2ec netlinksendmsg+0x198/0x3d0 syssendmsg+0x1b0/0x210 syssendmsg+0x80/0xf0 _syssendmsg+0x44/0xa0 _arm64syssendmsg+0x20/0x30 invokesyscall.constprop.0+0x4c/0xe0 doel0svc+0x40/0xd0 el0svc+0x14/0x4c el0t64synchandler+0x100/0x110 el0t64sync+0x15c/0x160 Code: d2800002 910092c0 52800023 f9800011 (885f7c01) ---[ end trace 7e42dd9a39ed2281 ]---

Fix by using mt76devphy() which will map band_idx to the correct phy for all hardware combinations.