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ALSA: rme9652: Hardening for potential Spectre v1

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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>
This commit is contained in:
Takashi Iwai 2018-04-24 08:04:41 +02:00
parent 10513142a7
commit f526afcd8f
1 changed files with 4 additions and 2 deletions
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6
sound/pci/rme9652/rme9652.c
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@ -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;