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b769f49463
Was: [PATCH] sound/oss/midi_synth: prevent underflow, use of uninitialized value, and signedness issue The offset passed to midi_synth_load_patch() can be essentially arbitrary. If it's greater than the header length, this will result in a copy_from_user(dst, src, negative_val). While this will just return -EFAULT on x86, on other architectures this may cause memory corruption. Additionally, the length field of the sysex_info structure may not be initialized prior to its use. Finally, a signed comparison may result in an unintentionally large loop. On suggestion by Takashi Iwai, version two removes the offset argument from the load_patch callbacks entirely, which also resolves similar issues in opl3. Compile tested only. v3 adjusts comments and hopefully gets copy offsets right. Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
48 lines
1.7 KiB
C
48 lines
1.7 KiB
C
int midi_synth_ioctl (int dev,
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unsigned int cmd, void __user * arg);
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int midi_synth_kill_note (int dev, int channel, int note, int velocity);
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int midi_synth_set_instr (int dev, int channel, int instr_no);
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int midi_synth_start_note (int dev, int channel, int note, int volume);
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void midi_synth_reset (int dev);
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int midi_synth_open (int dev, int mode);
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void midi_synth_close (int dev);
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void midi_synth_hw_control (int dev, unsigned char *event);
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int midi_synth_load_patch (int dev, int format, const char __user * addr,
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int count, int pmgr_flag);
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void midi_synth_panning (int dev, int channel, int pressure);
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void midi_synth_aftertouch (int dev, int channel, int pressure);
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void midi_synth_controller (int dev, int channel, int ctrl_num, int value);
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void midi_synth_bender (int dev, int chn, int value);
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void midi_synth_setup_voice (int dev, int voice, int chn);
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int midi_synth_send_sysex(int dev, unsigned char *bytes,int len);
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#ifndef _MIDI_SYNTH_C_
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static struct synth_info std_synth_info =
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{MIDI_SYNTH_NAME, 0, SYNTH_TYPE_MIDI, 0, 0, 128, 0, 128, MIDI_SYNTH_CAPS};
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static struct synth_operations std_midi_synth =
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{
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.owner = THIS_MODULE,
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.id = "MIDI",
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.info = &std_synth_info,
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.midi_dev = 0,
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.synth_type = SYNTH_TYPE_MIDI,
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.synth_subtype = 0,
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.open = midi_synth_open,
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.close = midi_synth_close,
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.ioctl = midi_synth_ioctl,
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.kill_note = midi_synth_kill_note,
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.start_note = midi_synth_start_note,
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.set_instr = midi_synth_set_instr,
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.reset = midi_synth_reset,
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.hw_control = midi_synth_hw_control,
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.load_patch = midi_synth_load_patch,
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.aftertouch = midi_synth_aftertouch,
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.controller = midi_synth_controller,
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.panning = midi_synth_panning,
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.bender = midi_synth_bender,
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.setup_voice = midi_synth_setup_voice,
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.send_sysex = midi_synth_send_sysex
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};
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#endif
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