2.6.29: ivtv-vbi.c: divide-by-zero in compress_sliced_buf()

[Mark Lord]

The changes to line_size in 2.6.29 now cause
attempts to record from my PVR250 cards (MythTV)
to die with a divide by zero error in ivtv-vbi.c.

The value of "line_size" in compress_sliced_buf() is zero.

divide error: 0000 [#1] PREEMPT SMP 
last sysfs file: /sys/block/sr0/removable
CPU 0 
Modules linked in: nfsd nfs lockd nfs_acl auth_rpcgss sunrpc ir_kbd_i2c ir_common battery sbs sbshc container ac usbhid tuner msp3400 saa7115 fan ivtv serio_raw nvidia(P) sky2 cx2341x firewire_ohci ehci_hcd thermal sg uhci_hcd intel_agp button processor xc5000 au8522 tea5767 tda9887 tda8290 tea5761 snd_usb_audio snd_usb_lib snd_hwdep au0828 usbcore tveeprom dvb_core snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc firewire_sbp2 firewire_core crc_itu_t fuse
Pid: 18548, comm: mythbackend Tainted: P       A   2.6.29 #1 OEM
RIP: 0010:[<ffffffffa09cabc4>]  [<ffffffffa09cabc4>] compress_sliced_buf+0x5c/0x14a [ivtv]
RSP: 0018:ffff88004e3b1c58  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88007c1b8300 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88007b5a0000
RBP: ffff88007c1b8000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffffa09c0818 R12: ffff88007b5a0000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88007b5a0000
FS:  000000004f219950(0063) GS:ffffffff80683040(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00007fd267365000 CR3: 0000000078dea000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process mythbackend (pid: 18548, threadinfo ffff88004e3b0000, task ffff880056895580)
Stack:
0000000000000000 ffff88007d199440 ffff88007e0e4e40 0000000000000202
ffff880001013100 0000000000000000 ffff880001013118 ffffffff80219939
0000000000000002 0000000000000300 ffff88007c1b8000 ffff88007b5a0000
Call Trace:
[<ffffffff80219939>] ? native_flush_tlb_others+0xaa/0xb5
[<ffffffffa09cb4a3>] ? ivtv_process_vbi_data+0x10f/0x51c [ivtv]
[<ffffffff8026de33>] ? __do_fault+0x399/0x3e1
[<ffffffff80223434>] ? ptep_set_access_flags+0x1a/0x1e
[<ffffffff8026e6bd>] ? do_wp_page+0x5d8/0x64d
[<ffffffffa09c0502>] ? ivtv_start_capture+0x54/0x217 [ivtv]
[<ffffffffa09c0d8f>] ? ivtv_v4l2_read+0x577/0xac4 [ivtv]
[<ffffffff80247d42>] ? getnstimeofday+0x56/0xb0
[<ffffffff80244ad7>] ? ktime_get_ts+0x21/0x49
[<ffffffff80241f34>] ? autoremove_wake_function+0x0/0x2e
[<ffffffff802853e3>] ? vfs_read+0xaa/0x133
[<ffffffff80285528>] ? sys_read+0x45/0x6e
[<ffffffff8020b49b>] ? system_call_fastpath+0x16/0x1b
Code: 0f 80 7b 02 00 75 09 8a 54 24 1f 38 53 03 74 09 ff c0 48 ff c3 39 c8 72 dd 29 c1 89 c8 44 39 f1 0f 82 e1 00 00 00 31 d2 45 31 ed <41> f7 f6 45 31 e4 89 44 24 18 31 ed e9 c0 00 00 00 89 e8 48 8d 
RIP  [<ffffffffa09cabc4>] compress_sliced_buf+0x5c/0x14a [ivtv]
RSP <ffff88004e3b1c58>
---[ end trace a154c5e5843294d8 ]---
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