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From dc58579c2c7e060084554018e9a2e8c25097a255 Mon Sep 17 00:00:00 2001
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From: "Timothy B. Terriberry" <tterribe@xiph.org>
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Date: Wed, 8 May 2013 10:25:52 -0700
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Subject: [PATCH] Fix several memory errors in the SILK resampler.
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1) The memcpy's were using sizeof(opus_int32), but the type of the
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local buffer was opus_int16.
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2) Because the size was wrong, this potentially allowed the source
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and destination regions of the memcpy overlap.
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I _believe_ that nSamplesIn is at least fs_in_khZ, which is at
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least 8.
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Since RESAMPLER_ORDER_FIR_12 is only 8, I don't think that's a
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problem once you fix the type size.
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3) The size of the buffer used RESAMPLER_MAX_BATCH_SIZE_IN, but the
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data stored in it was actually _twice_ the input batch size
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(nSamplesIn<<1).
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Because this never blew up in testing, I suspect that in practice
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the batch sizes are reasonable enough that none of these things
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was ever a problem, but proving that seems non-obvious.
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This patch just converts the whole thing to use CELT's vararrays.
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This fixes the buffer size problems (since we allocate a buffer
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with the actual size we use) and gets these large buffers off the
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stack on devices using the pseudo-stack.
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It also fixes the memcpy problems by changing the sizeof to
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opus_int16.
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It turns out sFIR, which saved state between calls, was being used
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elsewhere as opus_int32, so this converts it to a union to make
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this sharing explicit.
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---
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silk/resampler_private_IIR_FIR.c | 14 +++++++++-----
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silk/resampler_private_down_FIR.c | 4 ++--
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silk/resampler_structs.h | 5 ++++-
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3 files changed, 15 insertions(+), 8 deletions(-)
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diff --git a/silk/resampler_private_IIR_FIR.c b/silk/resampler_private_IIR_FIR.c
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index d9e42ca..2b9602d 100644
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--- a/silk/resampler_private_IIR_FIR.c
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+++ b/silk/resampler_private_IIR_FIR.c
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@@ -31,6 +31,7 @@ POSSIBILITY OF SUCH DAMAGE.
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#include "SigProc_FIX.h"
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#include "resampler_private.h"
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+#include "stack_alloc.h"
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static inline opus_int16 *silk_resampler_private_IIR_FIR_INTERPOL(
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opus_int16 *out,
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@@ -71,10 +72,13 @@ void silk_resampler_private_IIR_FIR(
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silk_resampler_state_struct *S = (silk_resampler_state_struct *)SS;
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opus_int32 nSamplesIn;
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opus_int32 max_index_Q16, index_increment_Q16;
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- opus_int16 buf[ RESAMPLER_MAX_BATCH_SIZE_IN + RESAMPLER_ORDER_FIR_12 ];
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+ VARDECL( opus_int16, buf );
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+ SAVE_STACK;
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+
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+ ALLOC( buf, 2 * S->batchSize + RESAMPLER_ORDER_FIR_12, opus_int16 );
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/* Copy buffered samples to start of buffer */
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- silk_memcpy( buf, S->sFIR, RESAMPLER_ORDER_FIR_12 * sizeof( opus_int32 ) );
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+ silk_memcpy( buf, S->sFIR.i16, RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
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/* Iterate over blocks of frameSizeIn input samples */
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index_increment_Q16 = S->invRatio_Q16;
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@@ -91,13 +95,13 @@ void silk_resampler_private_IIR_FIR(
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if( inLen > 0 ) {
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/* More iterations to do; copy last part of filtered signal to beginning of buffer */
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- silk_memcpy( buf, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int32 ) );
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+ silk_memcpy( buf, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
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} else {
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break;
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}
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}
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/* Copy last part of filtered signal to the state for the next call */
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- silk_memcpy( S->sFIR, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int32 ) );
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+ silk_memcpy( S->sFIR.i16, &buf[ nSamplesIn << 1 ], RESAMPLER_ORDER_FIR_12 * sizeof( opus_int16 ) );
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+ RESTORE_STACK;
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}
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-
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diff --git a/silk/resampler_private_down_FIR.c b/silk/resampler_private_down_FIR.c
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index 5d24564..8bedb0d 100644
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--- a/silk/resampler_private_down_FIR.c
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+++ b/silk/resampler_private_down_FIR.c
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@@ -155,7 +155,7 @@ void silk_resampler_private_down_FIR(
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const opus_int16 *FIR_Coefs;
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/* Copy buffered samples to start of buffer */
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- silk_memcpy( buf, S->sFIR, S->FIR_Order * sizeof( opus_int32 ) );
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+ silk_memcpy( buf, S->sFIR.i32, S->FIR_Order * sizeof( opus_int32 ) );
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FIR_Coefs = &S->Coefs[ 2 ];
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@@ -185,5 +185,5 @@ void silk_resampler_private_down_FIR(
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}
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/* Copy last part of filtered signal to the state for the next call */
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- silk_memcpy( S->sFIR, &buf[ nSamplesIn ], S->FIR_Order * sizeof( opus_int32 ) );
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+ silk_memcpy( S->sFIR.i32, &buf[ nSamplesIn ], S->FIR_Order * sizeof( opus_int32 ) );
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}
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diff --git a/silk/resampler_structs.h b/silk/resampler_structs.h
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index 4c28bd0..d1a0b95 100644
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--- a/silk/resampler_structs.h
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+++ b/silk/resampler_structs.h
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@@ -37,7 +37,10 @@ extern "C" {
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typedef struct _silk_resampler_state_struct{
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opus_int32 sIIR[ SILK_RESAMPLER_MAX_IIR_ORDER ]; /* this must be the first element of this struct */
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- opus_int32 sFIR[ SILK_RESAMPLER_MAX_FIR_ORDER ];
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+ union{
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+ opus_int32 i32[ SILK_RESAMPLER_MAX_FIR_ORDER ];
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+ opus_int16 i16[ SILK_RESAMPLER_MAX_FIR_ORDER ];
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+ } sFIR;
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opus_int16 delayBuf[ 48 ];
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opus_int resampler_function;
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opus_int batchSize;
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--
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1.8.4.2
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