Module: libav Branch: release/0.8 Commit: fbc52044f3d07f4f059214b314d17fd07bc4e12f
Author: Martin Storsjö <[email protected]> Committer: Luca Barbato <[email protected]> Date: Thu Sep 19 16:29:23 2013 +0300 fraps: Make the input buffer size checks more strict Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind CC: [email protected] Signed-off-by: Martin Storsjö <[email protected]> Conflicts: libavcodec/fraps.c --- libavcodec/fraps.c | 35 ++++++++++++++++++++++------------- 1 file changed, 22 insertions(+), 13 deletions(-) diff --git a/libavcodec/fraps.c b/libavcodec/fraps.c index 4d03057..23cfee8 100644 --- a/libavcodec/fraps.c +++ b/libavcodec/fraps.c @@ -139,10 +139,17 @@ static int decode_frame(AVCodecContext *avctx, uint32_t offs[4]; int i, j, is_chroma, planes; enum PixelFormat pix_fmt; + int prev_pic_bit, expected_size; + + if (buf_size < 4) { + av_log(avctx, AV_LOG_ERROR, "Packet is too short\n"); + return AVERROR_INVALIDDATA; + } header = AV_RL32(buf); version = header & 0xff; header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */ + prev_pic_bit = header & (1U << 31); /* bit 31 means same as previous pic */ if (version > 5) { av_log(avctx, AV_LOG_ERROR, @@ -161,16 +168,19 @@ static int decode_frame(AVCodecContext *avctx, } avctx->pix_fmt = pix_fmt; - switch(version) { + expected_size = header_size; + + switch (version) { case 0: default: /* Fraps v0 is a reordered YUV420 */ - if ( (buf_size != avctx->width*avctx->height*3/2+header_size) && - (buf_size != header_size) ) { + if (!prev_pic_bit) + expected_size += avctx->width * avctx->height * 3 / 2; + if (buf_size != expected_size) { av_log(avctx, AV_LOG_ERROR, "Invalid frame length %d (should be %d)\n", - buf_size, avctx->width*avctx->height*3/2+header_size); - return -1; + buf_size, expected_size); + return AVERROR_INVALIDDATA; } if (( (avctx->width % 8) != 0) || ( (avctx->height % 2) != 0 )) { @@ -187,8 +197,7 @@ static int decode_frame(AVCodecContext *avctx, av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); return -1; } - /* bit 31 means same as previous pic */ - f->pict_type = (header & (1U<<31))? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I; + f->pict_type = prev_pic_bit ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I; f->key_frame = f->pict_type == AV_PICTURE_TYPE_I; if (f->pict_type == AV_PICTURE_TYPE_I) { @@ -212,12 +221,13 @@ static int decode_frame(AVCodecContext *avctx, case 1: /* Fraps v1 is an upside-down BGR24 */ - if ( (buf_size != avctx->width*avctx->height*3+header_size) && - (buf_size != header_size) ) { + if (!prev_pic_bit) + expected_size += avctx->width * avctx->height * 3; + if (buf_size != expected_size) { av_log(avctx, AV_LOG_ERROR, "Invalid frame length %d (should be %d)\n", - buf_size, avctx->width*avctx->height*3+header_size); - return -1; + buf_size, expected_size); + return AVERROR_INVALIDDATA; } f->reference = 1; @@ -228,8 +238,7 @@ static int decode_frame(AVCodecContext *avctx, av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); return -1; } - /* bit 31 means same as previous pic */ - f->pict_type = (header & (1U<<31))? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I; + f->pict_type = prev_pic_bit ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I; f->key_frame = f->pict_type == AV_PICTURE_TYPE_I; if (f->pict_type == AV_PICTURE_TYPE_I) { _______________________________________________ libav-commits mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-commits
