From: Wu Fengguang Date: Fri, 17 Jul 2009 08:49:19 +0000 (+0800) Subject: ALSA: hda - add bounds checking for the codec command fields X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=6430aeeb30b478d4ef25f988b1fde6f6ae83adb5;p=linux-beck.git 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 Signed-off-by: Wu Fengguang Signed-off-by: Takashi Iwai --- diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index ec352c6ae49a..d9d326297834 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -150,7 +150,14 @@ make_codec_cmd(struct hda_codec *codec, hda_nid_t nid, int direct, { u32 val; - val = (u32)(codec->addr & 0x0f) << 28; + if ((codec->addr & ~0xf) | (direct & ~1) | (nid & ~0x7f) | + (verb & ~0xfff) | (parm & ~0xff)) { + printk(KERN_ERR "hda-codec: out of range cmd %x:%x:%x:%x:%x\n", + codec->addr, direct, nid, verb, parm); + return ~0; + } + + val = (u32)codec->addr << 28; val |= (u32)direct << 27; val |= (u32)nid << 20; val |= verb << 8; @@ -167,6 +174,9 @@ static int codec_exec_verb(struct hda_codec *codec, unsigned int cmd, struct hda_bus *bus = codec->bus; int err; + if (cmd == ~0) + return -1; + if (res) *res = -1; again: