ping... On 2019/4/23 22:56, Yue Haibing wrote: > From: YueHaibing <[email protected]> > > KASAN report this: > > walkera0701: failed to allocate input device > kasan: CONFIG_KASAN_INLINE enabled > kasan: GPF could be caused by NULL-ptr deref or user memory access > general protection fault: 0000 [#1] SMP KASAN PTI > CPU: 1 PID: 5324 Comm: syz-executor.0 Tainted: G C 5.1.0-rc3+ > #8 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 > 04/01/2014 > RIP: 0010:input_unregister_device+0x21/0xe0 drivers/input/input.c:2192 > Code: 2e 0f 1f 84 00 00 00 00 00 53 48 89 fb e8 07 41 f6 fe 48 8d bb 20 07 00 > 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 > 08 84 c0 0f 8e 92 00 00 00 80 bb 20 07 00 00 > RSP: 0018:ffff8881f58dfd30 EFLAGS: 00010206 > RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82460ca9 > RDX: 00000000000000e4 RSI: ffffc900013d3000 RDI: 0000000000000720 > RBP: 0000000000000000 R08: ffffed103d30caf7 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 > R13: ffffffffc1633000 R14: ffffffffc086b320 R15: 1ffff1103eb1bfaf > FS: 00007fa407200700(0000) GS:ffff8881f7300000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b33924000 CR3: 00000001e270c006 CR4: 00000000007606e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > PKRU: 55555554 > Call Trace: > walkera0701_detach+0x8e/0xba [walkera0701] > port_detach+0x73/0x90 [parport] > bus_for_each_dev+0x154/0x1e0 drivers/base/bus.c:304 > parport_unregister_driver+0x1f8/0x270 [parport] > __do_sys_delete_module kernel/module.c:1018 [inline] > __se_sys_delete_module kernel/module.c:961 [inline] > __x64_sys_delete_module+0x30c/0x480 kernel/module.c:961 > do_syscall_64+0x9f/0x450 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x462e99 > Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 48 89 f8 48 89 f7 48 > 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 > 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007fa4071ffc58 EFLAGS: 00000246 ORIG_RAX: 00000000000000b0 > RAX: ffffffffffffffda RBX: 000000000073bf00 RCX: 0000000000462e99 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0 > RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa4072006bc > R13: 00000000004bcca9 R14: 00000000006f6b48 R15: 00000000ffffffff > Modules linked in: walkera0701(-) tps65090_regulator intel_th mptbase adm1031 > snd_soc_wm8753 snd_soc_core snd_pcm_dmaengine snd_pcm ac97_bus snd_compress > rtc_ds1286 snd_seq_dummy snd_seq snd_timer snd_seq_device snd soundcore > comedi(C) i2c_mux_ltc4306 i2c_mux max14577_regulator max14577 usbcore hid > cmac mc13783_regulator mc13xxx_regulator_core mc13xxx_core of_mdio fixed_phy > libphy iptable_security iptable_raw iptable_mangle iptable_nat nf_nat > nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_filter bpfilter ip6_vti > ip_vti ip_gre ipip sit tunnel4 ip_tunnel hsr veth netdevsim vxcan batman_adv > cfg80211 rfkill chnl_net caif nlmon dummy team bonding vcan bridge stp llc > ip6_gre gre ip6_tunnel tunnel6 tun joydev mousedev ppdev tpm kvm_intel kvm > irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel > ide_pci_generic aesni_intel aes_x86_64 piix crypto_simd cryptd input_leds > ide_core psmouse glue_helper intel_agp serio_raw intel_gtt ata_generic > agpgart i2c_piix4 > pata_acpi parport_pc parport floppy rtc_cmos sch_fq_codel ip_tables x_tables > sha1_ssse3 sha1_generic ipv6 [last unloaded: walkera0701] > Dumping ftrace buffer: > (ftrace buffer empty) > ---[ end trace 17f6dd401f34af3e ]--- > > In walkera0701_attach(), if input_allocate_device failed, > w->input_dev is set to NULL. But in walkera0701_detach it > is not checked while passing to input_unregister_device(), > this will trigger a NULL pointer dereference issue. > > There is also another possible use-after-free issue, when > input_register_device() fails, input_free_device be > called to free input dev, then in walkera0701_detach() > calling input_unregister_device will trigger use-after-free > while accessing input dev > > This patch set w->parport to NULL on walkera0701_attach failed, > and only do detach in case attach success. > > Reported-by: Hulk Robot <[email protected]> > Fixes: 221bcb24c653 ("Input: walkera0701 - use parallel port device model") > Signed-off-by: YueHaibing <[email protected]> > --- > drivers/input/joystick/walkera0701.c | 10 ++++++---- > 1 file changed, 6 insertions(+), 4 deletions(-) > > diff --git a/drivers/input/joystick/walkera0701.c > b/drivers/input/joystick/walkera0701.c > index dce313d..852b8c5 100644 > --- a/drivers/input/joystick/walkera0701.c > +++ b/drivers/input/joystick/walkera0701.c > @@ -207,13 +207,13 @@ static void walkera0701_attach(struct parport *pp) > > if (pp->number != walkera0701_pp_no) { > pr_debug("Not using parport%d.\n", pp->number); > - return; > + goto err_out; > } > > if (pp->irq == -1) { > pr_err("parport %d does not have interrupt assigned\n", > pp->number); > - return; > + goto err_out; > } > > w->parport = pp; > @@ -228,7 +228,7 @@ static void walkera0701_attach(struct parport *pp) > > if (!w->pardevice) { > pr_err("failed to register parport device\n"); > - return; > + goto err_out; > } > > if (parport_negotiate(w->pardevice->port, IEEE1284_MODE_COMPAT)) { > @@ -279,13 +279,15 @@ static void walkera0701_attach(struct parport *pp) > input_free_device(w->input_dev); > err_unregister_device: > parport_unregister_device(w->pardevice); > +err_out: > + w->parport = NULL; > } > > static void walkera0701_detach(struct parport *port) > { > struct walkera_dev *w = &w_dev; > > - if (!w->pardevice || w->parport->number != port->number) > + if (!w->parport) > return; > > input_unregister_device(w->input_dev); >
