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authorTakashi Iwai <tiwai@suse.de>2018-04-24 08:03:14 +0200
committerTakashi Iwai <tiwai@suse.de>2018-04-25 10:37:48 +0200
commit10513142a7114d251670361ad40cba2c61403406 (patch)
tree181b3bd8506bd80ba40073fbe0ddea74924a4afc /sound
parentf9d94b57e30fd1575b4935045b32d738668aa74b (diff)
ALSA: hdspm: Hardening for potential Spectre v1
As recently Smatch suggested, a couple of places in HDSP MADI driver may expand the array directly from the user-space value with speculation: sound/pci/rme9652/hdspm.c:5717 snd_hdspm_channel_info() warn: potential spectre issue 'hdspm->channel_map_out' (local cap) sound/pci/rme9652/hdspm.c:5734 snd_hdspm_channel_info() warn: potential spectre issue 'hdspm->channel_map_in' (local cap) This patch puts array_index_nospec() for hardening against them. 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>
Diffstat (limited to 'sound')
-rw-r--r--sound/pci/rme9652/hdspm.c24
1 files changed, 14 insertions, 10 deletions
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 4c59983158e0..11b5b5e0e058 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -137,6 +137,7 @@
#include <linux/pci.h>
#include <linux/math64.h>
#include <linux/io.h>
+#include <linux/nospec.h>
#include <sound/core.h>
#include <sound/control.h>
@@ -5698,40 +5699,43 @@ static int snd_hdspm_channel_info(struct snd_pcm_substream *substream,
struct snd_pcm_channel_info *info)
{
struct hdspm *hdspm = snd_pcm_substream_chip(substream);
+ unsigned int channel = info->channel;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
- if (snd_BUG_ON(info->channel >= hdspm->max_channels_out)) {
+ if (snd_BUG_ON(channel >= hdspm->max_channels_out)) {
dev_info(hdspm->card->dev,
"snd_hdspm_channel_info: output channel out of range (%d)\n",
- info->channel);
+ channel);
return -EINVAL;
}
- if (hdspm->channel_map_out[info->channel] < 0) {
+ channel = array_index_nospec(channel, hdspm->max_channels_out);
+ if (hdspm->channel_map_out[channel] < 0) {
dev_info(hdspm->card->dev,
"snd_hdspm_channel_info: output channel %d mapped out\n",
- info->channel);
+ channel);
return -EINVAL;
}
- info->offset = hdspm->channel_map_out[info->channel] *
+ info->offset = hdspm->channel_map_out[channel] *
HDSPM_CHANNEL_BUFFER_BYTES;
} else {
- if (snd_BUG_ON(info->channel >= hdspm->max_channels_in)) {
+ if (snd_BUG_ON(channel >= hdspm->max_channels_in)) {
dev_info(hdspm->card->dev,
"snd_hdspm_channel_info: input channel out of range (%d)\n",
- info->channel);
+ channel);
return -EINVAL;
}
- if (hdspm->channel_map_in[info->channel] < 0) {
+ channel = array_index_nospec(channel, hdspm->max_channels_in);
+ if (hdspm->channel_map_in[channel] < 0) {
dev_info(hdspm->card->dev,
"snd_hdspm_channel_info: input channel %d mapped out\n",
- info->channel);
+ channel);
return -EINVAL;
}
- info->offset = hdspm->channel_map_in[info->channel] *
+ info->offset = hdspm->channel_map_in[channel] *
HDSPM_CHANNEL_BUFFER_BYTES;
}