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authorMichael Niedermayer <michael@niedermayer.cc>2017-07-14 00:45:29 +0200
committerMichael Niedermayer <michael@niedermayer.cc>2017-07-16 01:07:27 +0200
commit0ef8f03133a0bd83c74200a8cf30982c0f574016 (patch)
treea506fd1174da291c40bcdd7eebcbab49c57d74e6
parentd0ba0be35530bebe6cd83e470302ec6d38705453 (diff)
downloadffmpeg-0ef8f03133a0bd83c74200a8cf30982c0f574016.tar.gz
avcodec/aacdec_template: Fix undefined integer overflow in apply_tns()
Fixes: runtime error: signed integer overflow: -2147483648 - 1202286525 cannot be represented in type 'int' Fixes: 2071/clusterfuzz-testcase-minimized-6036414271586304 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
-rw-r--r--libavcodec/aac_defines.h2
-rw-r--r--libavcodec/aacdec_template.c5
2 files changed, 5 insertions, 2 deletions
diff --git a/libavcodec/aac_defines.h b/libavcodec/aac_defines.h
index 3c79a8a4a1..438d78a7aa 100644
--- a/libavcodec/aac_defines.h
+++ b/libavcodec/aac_defines.h
@@ -35,6 +35,7 @@
#define AAC_RENAME(x) x ## _fixed
#define AAC_RENAME_32(x) x ## _fixed_32
typedef int INTFLOAT;
+typedef unsigned UINTFLOAT; ///< Equivalent to INTFLOAT, Used as temporal cast to avoid undefined sign overflow operations.
typedef int64_t INT64FLOAT;
typedef int16_t SHORTFLOAT;
typedef SoftFloat AAC_FLOAT;
@@ -83,6 +84,7 @@ typedef int AAC_SIGNE;
#define AAC_RENAME(x) x
#define AAC_RENAME_32(x) x
typedef float INTFLOAT;
+typedef float UINTFLOAT;
typedef float INT64FLOAT;
typedef float SHORTFLOAT;
typedef float AAC_FLOAT;
diff --git a/libavcodec/aacdec_template.c b/libavcodec/aacdec_template.c
index 4cbbc6023a..c60a6ca096 100644
--- a/libavcodec/aacdec_template.c
+++ b/libavcodec/aacdec_template.c
@@ -2389,7 +2389,7 @@ static int decode_extension_payload(AACContext *ac, GetBitContext *gb, int cnt,
* @param decode 1 if tool is used normally, 0 if tool is used in LTP.
* @param coef spectral coefficients
*/
-static void apply_tns(INTFLOAT coef[1024], TemporalNoiseShaping *tns,
+static void apply_tns(INTFLOAT coef_param[1024], TemporalNoiseShaping *tns,
IndividualChannelStream *ics, int decode)
{
const int mmm = FFMIN(ics->tns_max_bands, ics->max_sfb);
@@ -2397,6 +2397,7 @@ static void apply_tns(INTFLOAT coef[1024], TemporalNoiseShaping *tns,
int bottom, top, order, start, end, size, inc;
INTFLOAT lpc[TNS_MAX_ORDER];
INTFLOAT tmp[TNS_MAX_ORDER+1];
+ UINTFLOAT *coef = coef_param;
for (w = 0; w < ics->num_windows; w++) {
bottom = ics->num_swb;
@@ -2426,7 +2427,7 @@ static void apply_tns(INTFLOAT coef[1024], TemporalNoiseShaping *tns,
// ar filter
for (m = 0; m < size; m++, start += inc)
for (i = 1; i <= FFMIN(m, order); i++)
- coef[start] -= AAC_MUL26(coef[start - i * inc], lpc[i - 1]);
+ coef[start] -= AAC_MUL26((INTFLOAT)coef[start - i * inc], lpc[i - 1]);
} else {
// ma filter
for (m = 0; m < size; m++, start += inc) {