| gst-ffmpeg: qdm2dec: fix buffer overflow. Fixes NGS00144 |
| |
| This also adds a few lines of code from master that are needed for this fix. |
| |
| Thanks to Phillip for suggestions to improve the patch. |
| Found-by: Phillip Langlois |
| |
| Upstream-Status: Backport |
| |
| Signed-off-by: Michael Niedermayer <michaelni@gmx.at> |
| --- |
| libavcodec/qdm2.c | 9 +++++++-- |
| 1 files changed, 7 insertions(+), 2 deletions(-) |
| |
| diff --git a/libavcodec/qdm2.c b/libavcodec/qdm2.c |
| index 3aa9e5b..e000df8 100644 |
| --- a/gst-libs/ext/libav/libavcodec/qdm2.c |
| +++ b/gst-libs/ext/libav/libavcodec/qdm2.c |
| @@ -76,6 +76,7 @@ do { \ |
| #define SAMPLES_NEEDED_2(why) \ |
| av_log (NULL,AV_LOG_INFO,"This file triggers some missing code. Please contact the developers.\nPosition: %s\n",why); |
| |
| +#define QDM2_MAX_FRAME_SIZE 512 |
| |
| typedef int8_t sb_int8_array[2][30][64]; |
| |
| @@ -168,7 +169,7 @@ typedef struct { |
| /// I/O data |
| const uint8_t *compressed_data; |
| int compressed_size; |
| - float output_buffer[1024]; |
| + float output_buffer[QDM2_MAX_FRAME_SIZE * MPA_MAX_CHANNELS * 2]; |
| |
| /// Synthesis filter |
| MPADSPContext mpadsp; |
| @@ -1819,6 +1820,9 @@ static av_cold int qdm2_decode_init(AVCodecContext *avctx) |
| s->group_order = av_log2(s->group_size) + 1; |
| s->frame_size = s->group_size / 16; // 16 iterations per super block |
| |
| + if (s->frame_size > QDM2_MAX_FRAME_SIZE) |
| + return AVERROR_INVALIDDATA; |
| + |
| s->sub_sampling = s->fft_order - 7; |
| s->frequency_range = 255 / (1 << (2 - s->sub_sampling)); |
| |
| @@ -1887,6 +1891,9 @@ static int qdm2_decode (QDM2Context *q, const uint8_t *in, int16_t *out) |
| int ch, i; |
| const int frame_size = (q->frame_size * q->channels); |
| |
| + if((unsigned)frame_size > FF_ARRAY_ELEMS(q->output_buffer)/2) |
| + return -1; |
| + |
| /* select input buffer */ |
| q->compressed_data = in; |
| q->compressed_size = q->checksum_size; |
| -- |
| 1.7.5.4 |
| |