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avcodec/speexdec: Seed should be unsigned otherwise the operations done on it are undefined

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Fixes: signed integer overflow: 1664525000 + 1013904223 cannot be represented in type 'int'
Fixes: 39865/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SPEEX_fuzzer-4979694508834816

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-10-12 14:50:41 +02:00
parent 77970abb71
commit 85c169f6a6
1 changed files with 5 additions and 5 deletions
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10
libavcodec/speexdec.c
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@ -140,7 +140,7 @@ typedef void (*innovation_quant_func)(float *, float *,
/** Innovation unquantization function */
typedef void (*innovation_unquant_func)(float *, const void *, int,
GetBitContext *, int32_t *);
GetBitContext *, uint32_t *);
typedef struct SpeexSubmode {
int lbr_pitch; /**< Set to -1 for "normal" modes, otherwise encode pitch using
@ -191,7 +191,7 @@ typedef struct DecoderState {
/* This is used in packet loss concealment */
int last_pitch; /**< Pitch of last correctly decoded frame */
float last_pitch_gain; /**< Pitch gain of last correctly decoded frame */
int32_t seed; /** Seed used for random number generation */
uint32_t seed; /** Seed used for random number generation */
int encode_submode;
const SpeexSubmode *const *submodes; /**< Sub-mode data */
@ -293,7 +293,7 @@ static void forced_pitch_unquant(float *exc, float *exc_out, int start, int end,
gain_val[1] = pitch_coef;
}
static inline float speex_rand(float std, int32_t *seed)
static inline float speex_rand(float std, uint32_t *seed)
{
const uint32_t jflone = 0x3f800000;
const uint32_t jflmsk = 0x007fffff;
@ -308,14 +308,14 @@ static inline float speex_rand(float std, int32_t *seed)
}
static void noise_codebook_unquant(float *exc, const void *par, int nsf,
GetBitContext *gb, int32_t *seed)
GetBitContext *gb, uint32_t *seed)
{
for (int i = 0; i < nsf; i++)
exc[i] = speex_rand(1.f, seed);
}
static void split_cb_shape_sign_unquant(float *exc, const void *par, int nsf,
GetBitContext *gb, int32_t *seed)
GetBitContext *gb, uint32_t *seed)
{
int subvect_size, nb_subvect, have_sign, shape_bits;
const SplitCodebookParams *params;