On Fri, Jul 17, 2009 at 04:27:03PM +0800, Wu Fengguang wrote:
On Fri, Jul 17, 2009 at 04:24:10PM +0800, Wu Fengguang wrote:
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
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c index 462e2ce..7d09650 100644 --- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -150,6 +150,16 @@ make_codec_cmd(struct hda_codec *codec, hda_nid_t nid, int direct, { u32 val;
- if ((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);Maybe we shall simply return here?
Here it is :)
--- 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 --- sound/pci/hda/hda_codec.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
--- sound-2.6.orig/sound/pci/hda/hda_codec.c +++ sound-2.6/sound/pci/hda/hda_codec.c @@ -150,7 +150,14 @@ make_codec_cmd(struct hda_codec *codec, { 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_co struct hda_bus *bus = codec->bus; int err;
+ if (cmd == ~0) + return -1; + if (res) *res = -1; again: