diff options
| author | Maurizio Lombardi <mlombard@redhat.com> | 2014-02-11 22:22:47 +0100 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2014-03-15 10:19:22 -0700 |
| commit | d6216c4734721900a835196309668134f83c641d (patch) | |
| tree | 2f4e569d9f6f0317b51ef5a1dad463b4172cc104 | |
| parent | 10b1db86e119881a6957a4ffe421d3f80a050a18 (diff) | |
[SCSI] st: fix corruption of the st_modedef structures in st_set_options()
When copying the st_modedef structures the devs pointers must be preserved
in the same way as with the cdevs pointers.
This fixes bug 70271: https://bugzilla.kernel.org/show_bug.cgi?id=70271
[ 135.037052] BUG: unable to handle kernel NULL pointer dereference at 0000000000000098
[ 135.045048] IP: [<ffffffff812af6a1>] kernfs_find_ns+0x21/0x150
[ 135.050999] PGD 220623067 PUD 222171067 PMD 0
[ 135.055593] Oops: 0000 [#1] SMP
[ 135.058938] Modules linked in: bnx2fc cnic uio fcoe libfcoe libfc 8021q mrp scsi_transport_fc garp scsi_tgt stp llc binfmt_misc dm_round_robin dm_multipath uinput iTCO_wdt iTCO_vendor_support microcode sg pcspkr serio_raw osst st(-) i2c_i801 lpc_ich mfd_core e1000e ptp pps_core ipmi_si ipmi_msghandler video tpm_infineon ext4(F) jbd2(F) mbcache(F) sd_mod(F) crc_t10dif(F) crct10dif_common(F) sr_mod(F) cdrom(F) pata_acpi(F) ata_generic(F) ata_piix(F) libata(F) mpt2sas(F) scsi_transport_sas(F) raid_class(F) ast(F) ttm(F) drm_kms_helper(F) drm(F) i2c_algo_bit(F) sysimgblt(F) sysfillrect(F) i2c_core(F) syscopyarea(F) dm_mirror(F) dm_region_hash(F) dm_log(F) dm_mod(F)
[ 135.119686] CPU: 2 PID: 2028 Comm: rmmod Tainted: GF 3.14.0-rc1-linux-mainline+ #14
[ 135.128453] Hardware name: wortmann To be filled by O.E.M./P8B-M Series, BIOS 6103 12/06/2012
[ 135.137127] task: ffff880001de29d0 ti: ffff8802206e4000 task.ti: ffff8802206e4000
[ 135.144742] RIP: 0010:[<ffffffff812af6a1>] [<ffffffff812af6a1>] kernfs_find_ns+0x21/0x150
[ 135.153148] RSP: 0018:ffff8802206e5c98 EFLAGS: 00010282
[ 135.158562] RAX: ffff880001de29d0 RBX: 0000000000000000 RCX: 0000000000000006
[ 135.165814] RDX: 0000000000000000 RSI: ffffffff817627e0 RDI: 0000000000000000
[ 135.173040] RBP: ffff8802206e5cc8 R08: 0000000000000000 R09: 0000000000000001
[ 135.180303] R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff817627e0
[ 135.187554] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
[ 135.194774] FS: 00007f817c720700(0000) GS:ffff880227200000(0000) knlGS:0000000000000000
[ 135.202995] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 135.208878] CR2: 0000000000000098 CR3: 00000002219b0000 CR4: 00000000000407e0
[ 135.216139] Stack:
[ 135.218185] ffffffff81af63a0 0000000000000000 ffffffff817627e0 0000000000000000
[ 135.225783] 0000000000000000 0000000000000001 ffff8802206e5cf8 ffffffff812af8de
[ 135.233347] ffff880226801900 ffffffff81b43320 0000000000000000 ffff880221a7c1c0
[ 135.240972] Call Trace:
[ 135.243463] [<ffffffff812af8de>] kernfs_find_and_get_ns+0x3e/0x70
[ 135.249743] [<ffffffff812ae27d>] sysfs_unmerge_group+0x1d/0x60
[ 135.255716] [<ffffffff81464da9>] pm_qos_sysfs_remove_latency+0x19/0x20
[ 135.262430] [<ffffffff81466a91>] dev_pm_qos_constraints_destroy+0x31/0x1e0
[ 135.269500] [<ffffffff81464de6>] dpm_sysfs_remove+0x16/0x50
[ 135.275263] [<ffffffff8145c077>] device_del+0x47/0x1e0
[ 135.280554] [<ffffffff8145c232>] device_unregister+0x22/0x60
[ 135.286406] [<ffffffffa02e23bd>] remove_cdevs+0x4d/0x90 [st]
[ 135.292247] [<ffffffffa02e78ff>] st_remove+0x3f/0xb0 [st]
[ 135.297851] [<ffffffff8145f39f>] __device_release_driver+0x7f/0xf0
[ 135.304237] [<ffffffff8145f4e8>] driver_detach+0xd8/0xe0
[ 135.309722] [<ffffffff8145e0fc>] bus_remove_driver+0x5c/0xd0
[ 135.315553] [<ffffffff81460170>] driver_unregister+0x30/0x70
[ 135.321366] [<ffffffffa02e97f4>] exit_st+0x5c/0x868 [st]
[ 135.326861] [<ffffffff8111b31a>] SyS_delete_module+0x19a/0x1f0
[ 135.332891] [<ffffffff810e336d>] ? trace_hardirqs_on+0xd/0x10
[ 135.338811] [<ffffffff81141974>] ? __audit_syscall_entry+0x94/0x100
[ 135.345282] [<ffffffff8135b1fe>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 135.351806] [<ffffffff816e8de9>] system_call_fastpath+0x16/0x1b
[ 135.357859] Code: ff eb e3 0f 1f 80 00 00 00 00 55 48 89 e5 48 83 ec 30 48 89 5d d8 4c 89 65 e0 4c 89 6d e8 4c 89 75 f0 4c 89 7d f8 66 66 66 66 90 <44> 0f b7 bf 98 00 00 00 8b 05 71 6d 87 00 48 89 fb 49 89 f4 49
[ 135.378282] RIP [<ffffffff812af6a1>] kernfs_find_ns+0x21/0x150
[ 135.384355] RSP <ffff8802206e5c98>
[ 135.387881] CR2: 0000000000000098
[ 135.391298] ---[ end trace 1968409221ddb3c8 ]---
Signed-off-by: Maurizio Lombardi <mlombard@redhat.com>
Acked-by: Kai Mäkisara <kai.makisara@kolumbus.fi>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
| -rw-r--r-- | drivers/scsi/st.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index a1d6986261a..afc834e172c 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -2198,12 +2198,19 @@ static int st_set_options(struct scsi_tape *STp, long options) struct st_modedef *STm; char *name = tape_name(STp); struct cdev *cd0, *cd1; + struct device *d0, *d1; STm = &(STp->modes[STp->current_mode]); if (!STm->defined) { - cd0 = STm->cdevs[0]; cd1 = STm->cdevs[1]; + cd0 = STm->cdevs[0]; + cd1 = STm->cdevs[1]; + d0 = STm->devs[0]; + d1 = STm->devs[1]; memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); - STm->cdevs[0] = cd0; STm->cdevs[1] = cd1; + STm->cdevs[0] = cd0; + STm->cdevs[1] = cd1; + STm->devs[0] = d0; + STm->devs[1] = d1; modes_defined = 1; DEBC(printk(ST_DEB_MSG "%s: Initialized mode %d definition from mode 0\n", |