In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries: Fix use after free in removephbdynamic() In removephbdynamic() we use &phb->ioresource, after we've called deviceunregister(&hostbridge->dev). But the unregister may have freed phb, because pcibiosfreecontrollerdeferred() is the release function for the hostbridge. If there are no outstanding references when we call deviceunregister() then phb will be freed out from under us. This has gone mainly unnoticed, but with slubdebug and pagepoison enabled it can lead to a crash: PID: 7574 TASK: c0000000d492cb80 CPU: 13 COMMAND: "drmgr" #0 [c0000000e4f075a0] crashkexec at c00000000027d7dc #1 [c0000000e4f075d0] oopsend at c000000000029608 #2 [c0000000e4f07650] _badpagefault at c0000000000904b4 #3 [c0000000e4f076c0] dobadslbfault at c00000000009a5a8 #4 [c0000000e4f076f0] dataaccessslbcommonvirt at c000000000008b30 Data SLB Access [380] exception frame: R0: c000000000167250 R1: c0000000e4f07a00 R2: c000000002a46100 R3: c000000002b39ce8 R4: 00000000000000c0 R5: 00000000000000a9 R6: 3894674d000000c0 R7: 0000000000000000 R8: 00000000000000ff R9: 0000000000000100 R10: 6b6b6b6b6b6b6b6b R11: 0000000000008000 R12: c00000000023da80 R13: c0000009ffd38b00 R14: 0000000000000000 R15: 000000011c87f0f0 R16: 0000000000000006 R17: 0000000000000003 R18: 0000000000000002 R19: 0000000000000004 R20: 0000000000000005 R21: 000000011c87ede8 R22: 000000011c87c5a8 R23: 000000011c87d3a0 R24: 0000000000000000 R25: 0000000000000001 R26: c0000000e4f07cc8 R27: c00000004d1cc400 R28: c0080000031d00e8 R29: c00000004d23d800 R30: c00000004d1d2400 R31: c00000004d1d2540 NIP: c000000000167258 MSR: 8000000000009033 OR3: c000000000e9f474 CTR: 0000000000000000 LR: c000000000167250 XER: 0000000020040003 CCR: 0000000024088420 MQ: 0000000000000000 DAR: 6b6b6b6b6b6b6ba3 DSISR: c0000000e4f07920 Syscall Result: fffffffffffffff2 [NIP : releaseresource+56] [LR : releaseresource+48] #5 [c0000000e4f07a00] releaseresource at c000000000167258 (unreliable) #6 [c0000000e4f07a30] removephbdynamic at c000000000105648 #7 [c0000000e4f07ab0] dlparremoveslot at c0080000031a09e8 [rpadlpario] #8 [c0000000e4f07b50] removeslotstore at c0080000031a0b9c [rpadlpario] #9 [c0000000e4f07be0] kobjattrstore at c000000000817d8c #10 [c0000000e4f07c00] sysfskfwrite at c00000000063e504 #11 [c0000000e4f07c20] kernfsfopwriteiter at c00000000063d868 #12 [c0000000e4f07c70] newsyncwrite at c00000000054339c #13 [c0000000e4f07d10] vfswrite at c000000000546624 #14 [c0000000e4f07d60] ksyswrite at c0000000005469f4 #15 [c0000000e4f07db0] systemcallexception at c000000000030840 #16 [c0000000e4f07e10] systemcallvectoredcommon at c00000000000c168 To avoid it, we can take a reference to the hostbridge->dev until we're done using phb. Then when we drop the reference the phb will be freed.
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