* [patch] ALSA: isa/wavefront: prevent some out of bound writes
@ 2016-05-04 6:27 Dan Carpenter
2016-05-08 9:39 ` Takashi Iwai
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2016-05-04 6:27 UTC (permalink / raw)
To: Jaroslav Kysela; +Cc: alsa-devel, kernel-janitors, Takashi Iwai, linux-kernel
"header->number" can be up to USHRT_MAX and it comes from the ioctl so
it needs to be capped.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
index 69f76ff..718d5e3 100644
--- a/sound/isa/wavefront/wavefront_synth.c
+++ b/sound/isa/wavefront/wavefront_synth.c
@@ -785,6 +785,9 @@ wavefront_send_patch (snd_wavefront_t *dev, wavefront_patch_info *header)
DPRINT (WF_DEBUG_LOAD_PATCH, "downloading patch %d\n",
header->number);
+ if (header->number >= ARRAY_SIZE(dev->patch_status))
+ return -EINVAL;
+
dev->patch_status[header->number] |= WF_SLOT_FILLED;
bptr = buf;
@@ -809,6 +812,9 @@ wavefront_send_program (snd_wavefront_t *dev, wavefront_patch_info *header)
DPRINT (WF_DEBUG_LOAD_PATCH, "downloading program %d\n",
header->number);
+ if (header->number >= ARRAY_SIZE(dev->prog_status))
+ return -EINVAL;
+
dev->prog_status[header->number] = WF_SLOT_USED;
/* XXX need to zero existing SLOT_USED bit for program_status[i]
@@ -898,6 +904,9 @@ wavefront_send_sample (snd_wavefront_t *dev,
header->number = x;
}
+ if (header->number >= WF_MAX_SAMPLE)
+ return -EINVAL;
+
if (header->size) {
/* XXX it's a debatable point whether or not RDONLY semantics
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [patch] ALSA: isa/wavefront: prevent some out of bound writes
2016-05-04 6:27 [patch] ALSA: isa/wavefront: prevent some out of bound writes Dan Carpenter
@ 2016-05-08 9:39 ` Takashi Iwai
0 siblings, 0 replies; 2+ messages in thread
From: Takashi Iwai @ 2016-05-08 9:39 UTC (permalink / raw)
To: Dan Carpenter; +Cc: Jaroslav Kysela, alsa-devel, kernel-janitors, linux-kernel
On Wed, 04 May 2016 08:27:37 +0200,
Dan Carpenter wrote:
>
> "header->number" can be up to USHRT_MAX and it comes from the ioctl so
> it needs to be capped.
>
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Applied, thanks.
Takashi
>
> diff --git a/sound/isa/wavefront/wavefront_synth.c b/sound/isa/wavefront/wavefront_synth.c
> index 69f76ff..718d5e3 100644
> --- a/sound/isa/wavefront/wavefront_synth.c
> +++ b/sound/isa/wavefront/wavefront_synth.c
> @@ -785,6 +785,9 @@ wavefront_send_patch (snd_wavefront_t *dev, wavefront_patch_info *header)
> DPRINT (WF_DEBUG_LOAD_PATCH, "downloading patch %d\n",
> header->number);
>
> + if (header->number >= ARRAY_SIZE(dev->patch_status))
> + return -EINVAL;
> +
> dev->patch_status[header->number] |= WF_SLOT_FILLED;
>
> bptr = buf;
> @@ -809,6 +812,9 @@ wavefront_send_program (snd_wavefront_t *dev, wavefront_patch_info *header)
> DPRINT (WF_DEBUG_LOAD_PATCH, "downloading program %d\n",
> header->number);
>
> + if (header->number >= ARRAY_SIZE(dev->prog_status))
> + return -EINVAL;
> +
> dev->prog_status[header->number] = WF_SLOT_USED;
>
> /* XXX need to zero existing SLOT_USED bit for program_status[i]
> @@ -898,6 +904,9 @@ wavefront_send_sample (snd_wavefront_t *dev,
> header->number = x;
> }
>
> + if (header->number >= WF_MAX_SAMPLE)
> + return -EINVAL;
> +
> if (header->size) {
>
> /* XXX it's a debatable point whether or not RDONLY semantics
>
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