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ffmpeg.wasm-core
Commit d0393d79 authored by Diego Biurrun's avatar Diego Biurrun
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huffyuv: Check and propagate function return values 

Bug-Id: CVE-2013-0868

inspired by a patch from Michael Niedermayer <michaelni@gmx.at>
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: 's avatarDiego Biurrun <diego@biurrun.de>

CC: libav-stable@libav.org
parent 62340581
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Showing with 61 additions and 44 deletions
libavcodec/huffyuvdec.c
View file @ d0393d79
......@@ -106,11 +106,13 @@ static int read_len_table(uint8_t *dst, GetBitContext *gb)
return 0;
}
static void generate_joint_tables(HYuvContext *s)
static int generate_joint_tables(HYuvContext *s)
{
uint16_t symbols[1 << VLC_BITS];
uint16_t bits[1 << VLC_BITS];
uint8_t len[1 << VLC_BITS];
int ret;
if (s->bitstream_bpp < 24) {
int p, i, y, u;
for (p = 0; p < 3; p++) {
......@@ -131,8 +133,9 @@ static void generate_joint_tables(HYuvContext *s)
}
}
ff_free_vlc(&s->vlc[3 + p]);
ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,
bits, 2, 2, symbols, 2, 2, 0);
if ((ret = ff_init_vlc_sparse(&s->vlc[3 + p], VLC_BITS, i, len, 1, 1,
bits, 2, 2, symbols, 2, 2, 0)) < 0)
return ret;
}
} else {
uint8_t (*map)[4] = (uint8_t(*)[4]) s->pix_bgr_map;
......@@ -173,28 +176,34 @@ static void generate_joint_tables(HYuvContext *s)
}
}
ff_free_vlc(&s->vlc[3]);
init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1, bits, 2, 2, 0);
if ((ret = init_vlc(&s->vlc[3], VLC_BITS, i, len, 1, 1,
bits, 2, 2, 0)) < 0)
return ret;
}
return 0;
}
static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
{
GetBitContext gb;
int i;
int i, ret;
init_get_bits(&gb, src, length * 8);
if ((ret = init_get_bits(&gb, src, length * 8)) < 0)
return ret;
for (i = 0; i < 3; i++) {
if (read_len_table(s->len[i], &gb) < 0)
return -1;
if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i]) < 0)
return -1;
if ((ret = read_len_table(s->len[i], &gb)) < 0)
return ret;
if ((ret = ff_huffyuv_generate_bits_table(s->bits[i], s->len[i])) < 0)
return ret;
ff_free_vlc(&s->vlc[i]);
init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
s->bits[i], 4, 4, 0);
if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
s->bits[i], 4, 4, 0)) < 0)
return ret;
}
generate_joint_tables(s);
if ((ret = generate_joint_tables(s)) < 0)
return ret;
return (get_bits_count(&gb) + 7) / 8;
}
......@@ -202,17 +211,19 @@ static int read_huffman_tables(HYuvContext *s, const uint8_t *src, int length)
static int read_old_huffman_tables(HYuvContext *s)
{
GetBitContext gb;
int i;
int i, ret;
init_get_bits(&gb, classic_shift_luma,
classic_shift_luma_table_size * 8);
if (read_len_table(s->len[0], &gb) < 0)
return -1;
if ((ret = init_get_bits(&gb, classic_shift_luma,
classic_shift_luma_table_size * 8)) < 0)
return ret;
if ((ret = read_len_table(s->len[0], &gb)) < 0)
return ret;
init_get_bits(&gb, classic_shift_chroma,
classic_shift_chroma_table_size * 8);
if (read_len_table(s->len[1], &gb) < 0)
return -1;
if ((ret = init_get_bits(&gb, classic_shift_chroma,
classic_shift_chroma_table_size * 8)) < 0)
return ret;
if ((ret = read_len_table(s->len[1], &gb)) < 0)
return ret;
for (i = 0; i < 256; i++)
s->bits[0][i] = classic_add_luma[i];
......@@ -228,11 +239,13 @@ static int read_old_huffman_tables(HYuvContext *s)
for (i = 0; i < 3; i++) {
ff_free_vlc(&s->vlc[i]);
init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
s->bits[i], 4, 4, 0);
if ((ret = init_vlc(&s->vlc[i], VLC_BITS, 256, s->len[i], 1, 1,
s->bits[i], 4, 4, 0)) < 0)
return ret;
}
generate_joint_tables(s);
if ((ret = generate_joint_tables(s)) < 0)
return ret;
return 0;
}
......@@ -240,6 +253,7 @@ static int read_old_huffman_tables(HYuvContext *s)
static av_cold int decode_init(AVCodecContext *avctx)
{
HYuvContext *s = avctx->priv_data;
int ret;
ff_huffyuv_common_init(avctx);
ff_huffyuvdsp_init(&s->hdsp);
......@@ -273,9 +287,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
s->context = avctx->extradata[2] & 0x40 ? 1 : 0;
if (read_huffman_tables(s, avctx->extradata + 4,
avctx->extradata_size - 4) < 0)
return -1;
if ((ret = read_huffman_tables(s, avctx->extradata + 4,
avctx->extradata_size - 4)) < 0)
return ret;
} else {
switch (avctx->bits_per_coded_sample & 7) {
case 1:
......@@ -302,8 +316,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
s->context = 0;
if (read_old_huffman_tables(s) < 0)
return -1;
if ((ret = read_old_huffman_tables(s)) < 0)
return ret;
}
switch (s->bitstream_bpp) {
......@@ -327,7 +341,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
return AVERROR_INVALIDDATA;
}
ff_huffyuv_alloc_temp(s);
if ((ret = ff_huffyuv_alloc_temp(s)) < 0)
return ret;
return 0;
}
......@@ -335,20 +350,21 @@ static av_cold int decode_init(AVCodecContext *avctx)
static av_cold int decode_init_thread_copy(AVCodecContext *avctx)
{
HYuvContext *s = avctx->priv_data;
int i;
int i, ret;
ff_huffyuv_alloc_temp(s);
if ((ret = ff_huffyuv_alloc_temp(s)) < 0)
return ret;
for (i = 0; i < 6; i++)
s->vlc[i].table = NULL;
if (s->version == 2) {
if (read_huffman_tables(s, avctx->extradata + 4,
avctx->extradata_size) < 0)
return -1;
if ((ret = read_huffman_tables(s, avctx->extradata + 4,
avctx->extradata_size)) < 0)
return ret;
} else {
if (read_old_huffman_tables(s) < 0)
return -1;
if ((ret = read_old_huffman_tables(s)) < 0)
return ret;
}
return 0;
......@@ -484,7 +500,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
int fake_ystride, fake_ustride, fake_vstride;
ThreadFrame frame = { .f = data };
AVFrame *const p = data;
int table_size = 0;
int table_size = 0, ret;
av_fast_malloc(&s->bitstream_buffer,
&s->bitstream_buffer_size,
......@@ -496,22 +512,23 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
s->bdsp.bswap_buf((uint32_t *) s->bitstream_buffer,
(const uint32_t *) buf, buf_size / 4);
if (ff_thread_get_buffer(avctx, &frame, 0) < 0) {
if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
return ret;
}
if (s->context) {
table_size = read_huffman_tables(s, s->bitstream_buffer, buf_size);
if (table_size < 0)
return -1;
return table_size;
}
if ((unsigned) (buf_size - table_size) >= INT_MAX / 8)
return AVERROR_INVALIDDATA;
init_get_bits(&s->gb, s->bitstream_buffer + table_size,
(buf_size - table_size) * 8);
if ((ret = init_get_bits(&s->gb, s->bitstream_buffer + table_size,
(buf_size - table_size) * 8)) < 0)
return ret;
fake_ystride = s->interlaced ? p->linesize[0] * 2 : p->linesize[0];
fake_ustride = s->interlaced ? p->linesize[1] * 2 : p->linesize[1];
......
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