/* * Driver for generic MPU-401 boards (UART mode only) * Copyright (c) by Jaroslav Kysela * Copyright (c) 2004 by Castet Matthieu * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include #include #include #include #include #include MODULE_AUTHOR("Jaroslav Kysela "); MODULE_DESCRIPTION("MPU-401 UART"); MODULE_LICENSE("GPL"); static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */ static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */ #ifdef CONFIG_PNP static bool pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; #endif static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* MPU-401 port number */ static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* MPU-401 IRQ */ static bool uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; module_param_array(index, int, NULL, 0444); MODULE_PARM_DESC(index, "Index value for MPU-401 device."); module_param_array(id, charp, NULL, 0444); MODULE_PARM_DESC(id, "ID string for MPU-401 device."); module_param_array(enable, bool, NULL, 0444); MODULE_PARM_DESC(enable, "Enable MPU-401 device."); #ifdef CONFIG_PNP module_param_array(pnp, bool, NULL, 0444); MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device."); #endif module_param_array(port, long, NULL, 0444); MODULE_PARM_DESC(port, "Port # for MPU-401 device."); module_param_array(irq, int, NULL, 0444); MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device."); module_param_array(uart_enter, bool, NULL, 0444); MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open."); static struct platform_device *platform_devices[SNDRV_CARDS]; static int pnp_registered; static unsigned int snd_mpu401_devices; static int snd_mpu401_create(struct device *devptr, int dev, struct snd_card **rcard) { struct snd_card *card; int err; if (!uart_enter[dev]) snd_printk(KERN_ERR "the uart_enter option is obsolete; remove it\n"); *rcard = NULL; err = snd_card_new(devptr, index[dev], id[dev], THIS_MODULE, 0, &card); if (err < 0) return err; strcpy(card->driver, "MPU-401 UART"); strcpy(card->shortname, card->driver); sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]); if (irq[dev] >= 0) { sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]); } else { strcat(card->longname, "polled"); } err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev], 0, irq[dev], NULL); if (err < 0) { printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]); goto _err; } *rcard = card; return 0; _err: snd_card_free(card); return err; } static int snd_mpu401_probe(struct platform_device *devptr) { int dev = devptr->id; int err; struct snd_card *card; if (port[dev] == SNDRV_AUTO_PORT) { snd_printk(KERN_ERR "specify port\n"); return -EINVAL; } if (irq[dev] == SNDRV_AUTO_IRQ) { snd_printk(KERN_ERR "specify or disable IRQ\n"); return -EINVAL; } err = snd_mpu401_create(&devptr->dev, dev, &card); if (err < 0) return err; if ((err = snd_card_register(card)) < 0) { snd_card_free(card); return err; } platform_set_drvdata(devptr, card); return 0; } static int snd_mpu401_remove(struct platform_device *devptr) { snd_card_free(platform_get_drvdata(devptr)); return 0; } #define SND_MPU401_DRIVER "snd_mpu401" static struct platform_driver snd_mpu401_driver = { .probe = snd_mpu401_probe, .remove = snd_mpu401_remove, .driver = { .name = SND_MPU401_DRIVER, }, }; #ifdef CONFIG_PNP #define IO_EXTENT 2 static struct pnp_device_id snd_mpu401_pnpids[] = { { .id = "PNPb006" }, { .id = "" } }; MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids); static int snd_mpu401_pnp(int dev, struct pnp_dev *device, const struct pnp_device_id *id) { if (!pnp_port_valid(device, 0) || pnp_port_flags(device, 0) & IORESOURCE_DISABLED) { snd_printk(KERN_ERR "no PnP port\n"); return -ENODEV; } if (pnp_port_len(device, 0) < IO_EXTENT) { snd_printk(KERN_ERR "PnP port length is %llu, expected %d\n", (unsigned long long)pnp_port_len(device, 0), IO_EXTENT); return -ENODEV; } port[dev] = pnp_port_start(device, 0); if (!pnp_irq_valid(device, 0) || pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) { snd_printk(KERN_WARNING "no PnP irq, using polling\n"); irq[dev] = -1; } else { irq[dev] = pnp_irq(device, 0); } return 0; } static int snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev, const struct pnp_device_id *id) { static int dev; struct snd_card *card; int err; for ( ; dev < SNDRV_CARDS; ++dev) { if (!enable[dev] || !pnp[dev]) continue; err = snd_mpu401_pnp(dev, pnp_dev, id); if (err < 0) return err; err = snd_mpu401_create(&pnp_dev->dev, dev, &card); if (err < 0) return err; if ((err = snd_card_register(card)) < 0) { snd_card_free(card); return err; } pnp_set_drvdata(pnp_dev, card); snd_mpu401_devices++; ++dev; return 0; } return -ENODEV; } static void snd_mpu401_pnp_remove(struct pnp_dev *dev) { struct snd_card *card = (struct snd_card *) pnp_get_drvdata(dev); snd_card_disconnect(card); snd_card_free_when_closed(card); } static struct pnp_driver snd_mpu401_pnp_driver = { .name = "mpu401", .id_table = snd_mpu401_pnpids, .probe = snd_mpu401_pnp_probe, .remove = snd_mpu401_pnp_remove, }; #else static struct pnp_driver snd_mpu401_pnp_driver; #endif static void snd_mpu401_unregister_all(void) { int i; if (pnp_registered) pnp_unregister_driver(&snd_mpu401_pnp_driver); for (i = 0; i < ARRAY_SIZE(platform_devices); ++i) platform_device_unregister(platform_devices[i]); platform_driver_unregister(&snd_mpu401_driver); } static int __init alsa_card_mpu401_init(void) { int i, err; if ((err = platform_driver_register(&snd_mpu401_driver)) < 0) return err; for (i = 0; i < SNDRV_CARDS; i++) { struct platform_device *device; if (! enable[i]) continue; #ifdef CONFIG_PNP if (pnp[i]) continue; #endif device = platform_device_register_simple(SND_MPU401_DRIVER, i, NULL, 0); if (IS_ERR(device)) continue; if (!platform_get_drvdata(device)) { platform_device_unregister(device); continue; } platform_devices[i] = device; snd_mpu401_devices++; } err = pnp_register_driver(&snd_mpu401_pnp_driver); if (!err) pnp_registered = 1; if (!snd_mpu401_devices) { #ifdef MODULE printk(KERN_ERR "MPU-401 device not found or device busy\n"); #endif snd_mpu401_unregister_all(); return -ENODEV; } return 0; } static void __exit alsa_card_mpu401_exit(void) { snd_mpu401_unregister_all(); } module_init(alsa_card_mpu401_init) module_exit(alsa_card_mpu401_exit) g of fw_state_wait() return value") a race can happen between this cancelation and the firmware fw_state_wait_timeout() being woken up after a state change with which fw_load_abort() as that calls swake_up(). Upon error fw_state_wait_timeout() will also again call fw_load_abort() and trigger a null reference. At first glance we could just fix this with a !buf check on fw_load_abort() before accessing buf->fw_st, however there is a logical issue in having a state machine used for the fallback mechanism and preventing access from it once we abort as its inside the buf (buf->fw_st). The firmware_class.c code is setting the buf to NULL to annotate an abort has occurred. Replace this mechanism by simply using the state check instead. All the other code in place already uses similar checks for aborting as well so no further changes are needed. An oops can be reproduced with the new fw_fallback.sh fallback mechanism cancellation test. Either cancelling the fallback mechanism or the custom fallback mechanism triggers a crash. mcgrof@piggy ~/linux-next/tools/testing/selftests/firmware (git::20170111-fw-fixes)$ sudo ./fw_fallback.sh ./fw_fallback.sh: timeout works ./fw_fallback.sh: firmware comparison works ./fw_fallback.sh: fallback mechanism works [ this then sits here when it is trying the cancellation test ] Kernel log: test_firmware: loading 'nope-test-firmware.bin' misc test_firmware: Direct firmware load for nope-test-firmware.bin failed with error -2 misc test_firmware: Falling back to user helper BUG: unable to handle kernel NULL pointer dereference at 0000000000000038 IP: _request_firmware+0xa27/0xad0 PGD 0 Oops: 0000 [#1] SMP Modules linked in: test_firmware(E) ... etc ... CPU: 1 PID: 1396 Comm: fw_fallback.sh Tainted: G W E 4.10.0-rc3-next-20170111+ #30 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.1-0-g8891697-prebuilt.qemu-project.org 04/01/2014 task: ffff9740b27f4340 task.stack: ffffbb15c0bc8000 RIP: 0010:_request_firmware+0xa27/0xad0 RSP: 0018:ffffbb15c0bcbd10 EFLAGS: 00010246 RAX: 00000000fffffffe RBX: ffff9740afe5aa80 RCX: 0000000000000000 RDX: ffff9740b27f4340 RSI: 0000000000000283 RDI: 0000000000000000 RBP: ffffbb15c0bcbd90 R08: ffffbb15c0bcbcd8 R09: 0000000000000000 R10: 0000000894a0d4b1 R11: 000000000000008c R12: ffffffffc0312480 R13: 0000000000000005 R14: ffff9740b1c32400 R15: 00000000000003e8 FS: 00007f8604422700(0000) GS:ffff9740bfc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000038 CR3: 000000012164c000 CR4: 00000000000006e0 Call Trace: request_firmware+0x37/0x50 trigger_request_store+0x79/0xd0 [test_firmware] dev_attr_store+0x18/0x30 sysfs_kf_write+0x37/0x40 kernfs_fop_write+0x110/0x1a0 __vfs_write+0x37/0x160 ? _cond_resched+0x1a/0x50 vfs_write+0xb5/0x1a0 SyS_write+0x55/0xc0 ? trace_do_page_fault+0x37/0xd0 entry_SYSCALL_64_fastpath+0x1e/0xad RIP: 0033:0x7f8603f49620 RSP: 002b:00007fff6287b788 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000055c307b110a0 RCX: 00007f8603f49620 RDX: 0000000000000016 RSI: 000055c3084d8a90 RDI: 0000000000000001 RBP: 0000000000000016 R08: 000000000000c0ff R09: 000055c3084d6336 R10: 000055c307b108b0 R11: 0000000000000246 R12: 000055c307b13c80 R13: 000055c3084d6320 R14: 0000000000000000 R15: 00007fff6287b950 Code: 9f 64 84 e8 9c 61 fe ff b8 f4 ff ff ff e9 6b f9 ff ff 48 c7 c7 40 6b 8d 84 89 45 a8 e8 43 84 18 00 49 8b be 00 03 00 00 8b 45 a8 <83> 7f 38 02 74 08 e8 6e ec ff ff 8b 45 a8 49 c7 86 00 03 00 00 RIP: _request_firmware+0xa27/0xad0 RSP: ffffbb15c0bcbd10 CR2: 0000000000000038 ---[ end trace 6d94ac339c133e6f ]--- Fixes: 5d47ec02c37e ("firmware: Correct handling of fw_state_wait() return value") Reported-and-Tested-by: Jakub Kicinski <jakub.kicinski@netronome.com> Reported-and-Tested-by: Patrick Bruenn <p.bruenn@beckhoff.com> Reported-by: Chris Wilson <chris@chris-wilson.co.uk> CC: <stable@vger.kernel.org> [3.10+] Signed-off-by: Luis R. Rodriguez <mcgrof@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/crypto/des.h')