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>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index ec352c6..d9d3262 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -150,7 +150,14 @@
{
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 @@
struct hda_bus *bus = codec->bus;
int err;
+ if (cmd == ~0)
+ return -1;
+
if (res)
*res = -1;
again: