ALSA: hda - add bounds checking for the codec command fields
A recent bug involves passing auto detected >0x7f NID to codec command, creating an invalid codec addr field, and finally lead to cmd timeout and fall back into single command mode. Jaroslav fixed that bug in alc880_parse_auto_config(). It would be safer to further check the bounds of all cmd fields. Cc: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -150,7 +150,14 @@ make_codec_cmd(struct hda_codec *codec, hda_nid_t nid, int direct,
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{
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u32 val;
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val = (u32)(codec->addr & 0x0f) << 28;
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if ((codec->addr & ~0xf) | (direct & ~1) | (nid & ~0x7f) |
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(verb & ~0xfff) | (parm & ~0xff)) {
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printk(KERN_ERR "hda-codec: out of range cmd %x:%x:%x:%x:%x\n",
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codec->addr, direct, nid, verb, parm);
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return ~0;
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}
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val = (u32)codec->addr << 28;
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val |= (u32)direct << 27;
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val |= (u32)nid << 20;
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val |= verb << 8;
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@ -167,6 +174,9 @@ static int codec_exec_verb(struct hda_codec *codec, unsigned int cmd,
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struct hda_bus *bus = codec->bus;
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int err;
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if (cmd == ~0)
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return -1;
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if (res)
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*res = -1;
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again:
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