diff options
| author | Luca Barbato <lu_zero@gentoo.org> | 2013-07-22 23:26:05 +0200 |
|---|---|---|
| committer | Luca Barbato <lu_zero@gentoo.org> | 2013-07-23 23:03:37 +0200 |
| commit | bd7b4da0f4627bb6c4a7c2575da83fe6b261a21c (patch) | |
| tree | cb73e5653e87e72e4d5703377b8fa44bb3d20c9b /libavcodec/8bps.c | |
| parent | 2f034f255c49050e894ab9b88087c09ebe249f3f (diff) | |
| download | ffmpeg-bd7b4da0f4627bb6c4a7c2575da83fe6b261a21c.tar.gz | |
8bps: Bound-check the input buffer
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Diffstat (limited to 'libavcodec/8bps.c')
| -rw-r--r-- | libavcodec/8bps.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/libavcodec/8bps.c b/libavcodec/8bps.c index fcb7b2bfcd..dbe1f22915 100644 --- a/libavcodec/8bps.c +++ b/libavcodec/8bps.c @@ -64,7 +64,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, unsigned char *pixptr, *pixptr_end; unsigned int height = avctx->height; // Real image height unsigned int dlen, p, row; - const unsigned char *lp, *dp; + const unsigned char *lp, *dp, *ep; unsigned char count; unsigned int px_inc; unsigned int planes = c->planes; @@ -76,6 +76,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, return ret; } + ep = encoded + buf_size; + /* Set data pointer after line lengths */ dp = encoded + planes * (height << 1); @@ -93,17 +95,19 @@ static int decode_frame(AVCodecContext *avctx, void *data, for (row = 0; row < height; row++) { pixptr = frame->data[0] + row * frame->linesize[0] + planemap[p]; pixptr_end = pixptr + frame->linesize[0]; + if (ep - lp < row * 2 + 2) + return AVERROR_INVALIDDATA; dlen = av_be2ne16(*(const unsigned short *)(lp + row * 2)); /* Decode a row of this plane */ while (dlen > 0) { - if (dp + 1 >= buf + buf_size) + if (ep - dp <= 1) return AVERROR_INVALIDDATA; if ((count = *dp++) <= 127) { count++; dlen -= count + 1; if (pixptr + count * px_inc > pixptr_end) break; - if (dp + count > buf + buf_size) + if (ep - dp < count) return AVERROR_INVALIDDATA; while (count--) { *pixptr = *dp++; |