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Diffstat (limited to 'libavcodec/g2meet.c')
-rw-r--r--libavcodec/g2meet.c51
1 files changed, 29 insertions, 22 deletions
diff --git a/libavcodec/g2meet.c b/libavcodec/g2meet.c
index c405f38e42..1004e1921e 100644
--- a/libavcodec/g2meet.c
+++ b/libavcodec/g2meet.c
@@ -2,20 +2,20 @@
* Go2Webinar decoder
* Copyright (c) 2012 Konstantin Shishkov
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -384,6 +384,8 @@ static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
src += 3;
}
npal = *src++ + 1;
+ if (src_end - src < npal * 3)
+ return AVERROR_INVALIDDATA;
memcpy(pal, src, npal * 3);
src += npal * 3;
if (sub_type != 2) {
@@ -400,7 +402,7 @@ static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
zsize = (src[0] << 8) | src[1];
src += 2;
- if (src_end - src < zsize)
+ if (src_end - src < zsize + (sub_type != 2))
return AVERROR_INVALIDDATA;
ret = uncompress(c->kempf_buf, &dlen, src, zsize);
@@ -422,6 +424,8 @@ static int kempf_decode_tile(G2MContext *c, int tile_x, int tile_y,
for (i = 0; i < (FFALIGN(height, 16) >> 4); i++) {
for (j = 0; j < (FFALIGN(width, 16) >> 4); j++) {
if (!bits) {
+ if (src >= src_end)
+ return AVERROR_INVALIDDATA;
bitbuf = *src++;
bits = 8;
}
@@ -455,8 +459,8 @@ static int g2m_init_buffers(G2MContext *c)
int aligned_height;
if (!c->framebuf || c->old_width < c->width || c->old_height < c->height) {
- c->framebuf_stride = FFALIGN(c->width * 3, 16);
- aligned_height = FFALIGN(c->height, 16);
+ c->framebuf_stride = FFALIGN(c->width + 15, 16) * 3;
+ aligned_height = c->height + 15;
av_free(c->framebuf);
c->framebuf = av_mallocz(c->framebuf_stride * aligned_height);
if (!c->framebuf)
@@ -465,7 +469,7 @@ static int g2m_init_buffers(G2MContext *c)
if (!c->synth_tile || !c->jpeg_tile ||
c->old_tile_w < c->tile_width ||
c->old_tile_h < c->tile_height) {
- c->tile_stride = FFALIGN(c->tile_width * 3, 16);
+ c->tile_stride = FFALIGN(c->tile_width, 16) * 3;
aligned_height = FFALIGN(c->tile_height, 16);
av_free(c->synth_tile);
av_free(c->jpeg_tile);
@@ -501,7 +505,7 @@ static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
cursor_hot_y = bytestream2_get_byte(gb);
cursor_fmt = bytestream2_get_byte(gb);
- cursor_stride = FFALIGN(cursor_w, 32) * 4;
+ cursor_stride = FFALIGN(cursor_w, cursor_fmt==1 ? 32 : 1) * 4;
if (cursor_w < 1 || cursor_w > 256 ||
cursor_h < 1 || cursor_h > 256) {
@@ -551,7 +555,6 @@ static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
bits <<= 1;
}
}
- dst += c->cursor_stride - c->cursor_w * 4;
}
dst = c->cursor;
@@ -583,7 +586,6 @@ static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
bits <<= 1;
}
}
- dst += c->cursor_stride - c->cursor_w * 4;
}
break;
case 32: // full colour
@@ -597,7 +599,6 @@ static int g2m_load_cursor(AVCodecContext *avctx, G2MContext *c,
*dst++ = val >> 16;
*dst++ = val >> 24;
}
- dst += c->cursor_stride - c->cursor_w * 4;
}
break;
default:
@@ -703,6 +704,7 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
}
switch (chunk_type) {
case DISPLAY_INFO:
+ got_header =
c->got_header = 0;
if (chunk_size < 21) {
av_log(avctx, AV_LOG_ERROR, "Invalid display info size %"PRIu32"\n",
@@ -719,14 +721,18 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
ret = AVERROR_INVALIDDATA;
goto header_fail;
}
- if (c->width != avctx->width || c->height != avctx->height)
- ff_set_dimensions(avctx, c->width, c->height);
+ if (c->width != avctx->width || c->height != avctx->height) {
+ ret = ff_set_dimensions(avctx, c->width, c->height);
+ if (ret < 0)
+ goto header_fail;
+ }
c->compression = bytestream2_get_be32(&bc);
if (c->compression != 2 && c->compression != 3) {
av_log(avctx, AV_LOG_ERROR,
"Unknown compression method %d\n",
c->compression);
- return AVERROR_PATCHWELCOME;
+ ret = AVERROR_PATCHWELCOME;
+ goto header_fail;
}
c->tile_width = bytestream2_get_be32(&bc);
c->tile_height = bytestream2_get_be32(&bc);
@@ -746,7 +752,8 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
(chunk_size - 21) < 16) {
av_log(avctx, AV_LOG_ERROR,
"Display info: missing bitmasks!\n");
- return AVERROR_INVALIDDATA;
+ ret = AVERROR_INVALIDDATA;
+ goto header_fail;
}
r_mask = bytestream2_get_be32(&bc);
g_mask = bytestream2_get_be32(&bc);
@@ -755,11 +762,13 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
av_log(avctx, AV_LOG_ERROR,
"Invalid or unsupported bitmasks: R=%"PRIX32", G=%"PRIX32", B=%"PRIX32"\n",
r_mask, g_mask, b_mask);
- return AVERROR_PATCHWELCOME;
+ ret = AVERROR_PATCHWELCOME;
+ goto header_fail;
}
} else {
avpriv_request_sample(avctx, "bpp=%d", c->bpp);
- return AVERROR_PATCHWELCOME;
+ ret = AVERROR_PATCHWELCOME;
+ goto header_fail;
}
if (g2m_init_buffers(c)) {
ret = AVERROR(ENOMEM);
@@ -835,11 +844,9 @@ static int g2m_decode_frame(AVCodecContext *avctx, void *data,
if (got_header)
c->got_header = 1;
- if (c->width && c->height) {
- if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) {
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ if (c->width && c->height && c->framebuf) {
+ if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
- }
pic->key_frame = got_header;
pic->pict_type = got_header ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-10 05:50:43 +0000