ALSA: rme9652: Hardening for potential Spectre v1

As recently Smatch suggested, one place in RME9652 driver may expand
the array directly from the user-space value with speculation:
  sound/pci/rme9652/rme9652.c:2074 snd_rme9652_channel_info() warn: potential spectre issue 'rme9652->channel_map' (local cap)

This patch puts array_index_nospec() for hardening against it.

BugLink: https://marc.info/?l=linux-kernel&m=152411496503418&w=2
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 4 insertions, 2 deletions

diff --git a/sound/pci/rme9652/rme9652.c b/sound/pci/rme9652/rme9652.c
index df648b1d9217..edd765e22377 100644
--- a/sound/pci/rme9652/rme9652.c
+++ b/sound/pci/rme9652/rme9652.c
@@ -26,6 +26,7 @@
 #include <linux/pci.h>
 #include <linux/module.h>
 #include <linux/io.h>
+#include <linux/nospec.h>
 
 #include <sound/core.h>
 #include <sound/control.h>
@@ -2071,9 +2072,10 @@ static int snd_rme9652_channel_info(struct snd_pcm_substream *substream,
         if (snd_BUG_ON(info->channel >= RME9652_NCHANNELS))
                 return -EINVAL;
 
-        if ((chn = rme9652->channel_map[info->channel]) < 0) {
+        chn = rme9652->channel_map[array_index_nospec(info->channel,
+                                                      RME9652_NCHANNELS)];
+        if (chn < 0)
                 return -EINVAL;
-        }
 
         info->offset = chn * RME9652_CHANNEL_BUFFER_BYTES;
         info->first = 0;