DivestOS/Patches/Linux_CVEs/CVE-2012-6703/ANY/2.patch

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2017-10-29 14:23:02 -04:00
From 4dc040a0b34890d2adc0d63da6e9bfb4eb791b19 Mon Sep 17 00:00:00 2001
From: Vinod Koul <vinod.koul@linux.intel.com>
Date: Mon, 17 Sep 2012 11:51:25 +0530
Subject: [PATCH] ALSA: compress - move the buffer check
Commit ALSA: compress_core: integer overflow in snd_compr_allocate_buffer()
added a new error check for input params.
this add new routine for input checks and moves buffer overflow check to this
new routine. This allows the error value to be propogated to user space
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/core/compress_offload.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 68fe02c7400a2..bd7f28e892540 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -407,10 +407,6 @@ static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
unsigned int buffer_size;
void *buffer;
- if (params->buffer.fragment_size == 0 ||
- params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
- return -EINVAL;
-
buffer_size = params->buffer.fragment_size * params->buffer.fragments;
if (stream->ops->copy) {
buffer = NULL;
@@ -429,6 +425,16 @@ static int snd_compr_allocate_buffer(struct snd_compr_stream *stream,
return 0;
}
+static int snd_compress_check_input(struct snd_compr_params *params)
+{
+ /* first let's check the buffer parameter's */
+ if (params->buffer.fragment_size == 0 ||
+ params->buffer.fragments > SIZE_MAX / params->buffer.fragment_size)
+ return -EINVAL;
+
+ return 0;
+}
+
static int
snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
{
@@ -447,11 +453,17 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
retval = -EFAULT;
goto out;
}
+
+ retval = snd_compress_check_input(params);
+ if (retval)
+ goto out;
+
retval = snd_compr_allocate_buffer(stream, params);
if (retval) {
retval = -ENOMEM;
goto out;
}
+
retval = stream->ops->set_params(stream, params);
if (retval)
goto out;