diff options
Diffstat (limited to 'libavcodec/vmnc.c')
| -rw-r--r-- | libavcodec/vmnc.c | 56 |
1 files changed, 31 insertions, 25 deletions
diff --git a/libavcodec/vmnc.c b/libavcodec/vmnc.c index 23cfe25453..58bd0e26ae 100644 --- a/libavcodec/vmnc.c +++ b/libavcodec/vmnc.c @@ -2,20 +2,20 @@ * VMware Screen Codec (VMnc) decoder * Copyright (c) 2006 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 */ @@ -291,6 +291,11 @@ static int decode_hextile(VmncContext *c, uint8_t* dst, GetByteContext *gb, fg = vmnc_get_pixel(gb, bpp, c->bigendian); xy = bytestream2_get_byte(gb); wh = bytestream2_get_byte(gb); + if ( (xy >> 4) + (wh >> 4) + 1 > w - i + || (xy & 0xF) + (wh & 0xF)+1 > h - j) { + av_log(c->avctx, AV_LOG_ERROR, "Rectangle outside picture\n"); + return AVERROR_INVALIDDATA; + } paint_rect(dst2, xy >> 4, xy & 0xF, (wh>>4)+1, (wh & 0xF)+1, fg, bpp, stride); } @@ -307,6 +312,8 @@ static void reset_buffers(VmncContext *c) av_freep(&c->curmask); av_freep(&c->screendta); c->cur_w = c->cur_h = 0; + c->cur_hx = c->cur_hy = 0; + } static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, @@ -319,10 +326,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, uint8_t *outptr; int dx, dy, w, h, depth, enc, chunks, res, size_left, ret; - if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) { - av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); + if ((ret = ff_reget_buffer(avctx, c->pic)) < 0) return ret; - } bytestream2_init(gb, buf, buf_size); @@ -360,6 +365,10 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, bytestream2_skip(gb, 2); chunks = bytestream2_get_be16(gb); while (chunks--) { + if (bytestream2_get_bytes_left(gb) < 12) { + av_log(avctx, AV_LOG_ERROR, "Premature end of data!\n"); + return -1; + } dx = bytestream2_get_be16(gb); dy = bytestream2_get_be16(gb); w = bytestream2_get_be16(gb); @@ -369,6 +378,10 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, size_left = bytestream2_get_bytes_left(gb); switch (enc) { case MAGIC_WMVd: // cursor + if (w*(int64_t)h*c->bpp2 > INT_MAX/2 - 2) { + av_log(avctx, AV_LOG_ERROR, "dimensions too large\n"); + return AVERROR_INVALIDDATA; + } if (size_left < 2 + w * h * c->bpp2 * 2) { av_log(avctx, AV_LOG_ERROR, "Premature end of data! (need %i got %i)\n", @@ -419,18 +432,10 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, c->pic->pict_type = AV_PICTURE_TYPE_I; depth = bytestream2_get_byte(gb); if (depth != c->bpp) { - av_log(avctx, AV_LOG_WARNING, "Depth mismatch. " - "Container %i bpp / Codec %i bpp\n", c->bpp, depth); - - if (depth != 8 && depth != 16 && depth != 32) { - av_log(avctx, AV_LOG_ERROR, - "Unsupported codec bitdepth %i\n", depth); - return AVERROR_INVALIDDATA; - } - - /* reset values */ - c->bpp = depth; - c->bpp2 = c->bpp / 8; + av_log(avctx, AV_LOG_INFO, + "Depth mismatch. Container %i bpp, " + "Frame data: %i bpp\n", + c->bpp, depth); } bytestream2_skip(gb, 1); c->bigendian = bytestream2_get_byte(gb); @@ -523,7 +528,6 @@ static av_cold int decode_init(AVCodecContext *avctx) c->width = avctx->width; c->height = avctx->height; c->bpp = avctx->bits_per_coded_sample; - c->bpp2 = c->bpp / 8; switch (c->bpp) { case 8: @@ -534,14 +538,16 @@ static av_cold int decode_init(AVCodecContext *avctx) break; case 24: /* 24 bits is not technically supported, but some clients might - * mistakenly set it -- delay the actual check until decode_frame() */ + * mistakenly set it, so let's assume they actually meant 32 bits */ + c->bpp = 32; case 32: - avctx->pix_fmt = AV_PIX_FMT_RGB32; + avctx->pix_fmt = AV_PIX_FMT_0RGB32; break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", c->bpp); return AVERROR_INVALIDDATA; } + c->bpp2 = c->bpp / 8; c->pic = av_frame_alloc(); if (!c->pic) @@ -556,9 +562,9 @@ static av_cold int decode_end(AVCodecContext *avctx) av_frame_free(&c->pic); - av_free(c->curbits); - av_free(c->curmask); - av_free(c->screendta); + av_freep(&c->curbits); + av_freep(&c->curmask); + av_freep(&c->screendta); return 0; } |