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| author | Reinhard Tartler <siretart@tauware.de> | 2010-10-02 07:42:42 +0000 |
|---|---|---|
| committer | Reinhard Tartler <siretart@tauware.de> | 2010-10-02 07:42:42 +0000 |
| commit | 79a16f0cac9a7251c7849923a25ddb048b5ce5f6 (patch) | |
| tree | 9ae4a89fd7d83528e09f846c29dd97341b3d8f10 | |
| parent | 9ad774ff3339634ed9c1727d6af151dbb4731f94 (diff) | |
| download | ffmpeg-79a16f0cac9a7251c7849923a25ddb048b5ce5f6.tar.gz | |
Fix several security issues in flicvideo.c
This fixes CVE-2010-3429
backport r25223 by michael
Originally committed as revision 25307 to svn://svn.ffmpeg.org/ffmpeg/branches/0.6
| -rw-r--r-- | libavcodec/flicvideo.c | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/libavcodec/flicvideo.c b/libavcodec/flicvideo.c index 429ded53b2..b63d7d4498 100644 --- a/libavcodec/flicvideo.c +++ b/libavcodec/flicvideo.c @@ -159,7 +159,7 @@ static int flic_decode_frame_8BPP(AVCodecContext *avctx, int pixel_skip; int pixel_countdown; unsigned char *pixels; - int pixel_limit; + unsigned int pixel_limit; s->frame.reference = 1; s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; @@ -253,10 +253,13 @@ static int flic_decode_frame_8BPP(AVCodecContext *avctx, av_log(avctx, AV_LOG_ERROR, "Undefined opcode (%x) in DELTA_FLI\n", line_packets); } else if ((line_packets & 0xC000) == 0x8000) { // "last byte" opcode - pixels[y_ptr + s->frame.linesize[0] - 1] = line_packets & 0xff; + pixel_ptr= y_ptr + s->frame.linesize[0] - 1; + CHECK_PIXEL_PTR(0); + pixels[pixel_ptr] = line_packets & 0xff; } else { compressed_lines--; pixel_ptr = y_ptr; + CHECK_PIXEL_PTR(0); pixel_countdown = s->avctx->width; for (i = 0; i < line_packets; i++) { /* account for the skip bytes */ @@ -268,7 +271,7 @@ static int flic_decode_frame_8BPP(AVCodecContext *avctx, byte_run = -byte_run; palette_idx1 = buf[stream_ptr++]; palette_idx2 = buf[stream_ptr++]; - CHECK_PIXEL_PTR(byte_run); + CHECK_PIXEL_PTR(byte_run * 2); for (j = 0; j < byte_run; j++, pixel_countdown -= 2) { pixels[pixel_ptr++] = palette_idx1; pixels[pixel_ptr++] = palette_idx2; @@ -298,6 +301,7 @@ static int flic_decode_frame_8BPP(AVCodecContext *avctx, stream_ptr += 2; while (compressed_lines > 0) { pixel_ptr = y_ptr; + CHECK_PIXEL_PTR(0); pixel_countdown = s->avctx->width; line_packets = buf[stream_ptr++]; if (line_packets > 0) { @@ -453,7 +457,7 @@ static int flic_decode_frame_15_16BPP(AVCodecContext *avctx, int pixel_countdown; unsigned char *pixels; int pixel; - int pixel_limit; + unsigned int pixel_limit; s->frame.reference = 1; s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; @@ -503,6 +507,7 @@ static int flic_decode_frame_15_16BPP(AVCodecContext *avctx, } else { compressed_lines--; pixel_ptr = y_ptr; + CHECK_PIXEL_PTR(0); pixel_countdown = s->avctx->width; for (i = 0; i < line_packets; i++) { /* account for the skip bytes */ @@ -514,13 +519,13 @@ static int flic_decode_frame_15_16BPP(AVCodecContext *avctx, byte_run = -byte_run; pixel = AV_RL16(&buf[stream_ptr]); stream_ptr += 2; - CHECK_PIXEL_PTR(byte_run); + CHECK_PIXEL_PTR(2 * byte_run); for (j = 0; j < byte_run; j++, pixel_countdown -= 2) { *((signed short*)(&pixels[pixel_ptr])) = pixel; pixel_ptr += 2; } } else { - CHECK_PIXEL_PTR(byte_run); + CHECK_PIXEL_PTR(2 * byte_run); for (j = 0; j < byte_run; j++, pixel_countdown--) { *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]); stream_ptr += 2; @@ -611,7 +616,7 @@ static int flic_decode_frame_15_16BPP(AVCodecContext *avctx, if (byte_run > 0) { pixel = AV_RL16(&buf[stream_ptr]); stream_ptr += 2; - CHECK_PIXEL_PTR(byte_run); + CHECK_PIXEL_PTR(2 * byte_run); for (j = 0; j < byte_run; j++) { *((signed short*)(&pixels[pixel_ptr])) = pixel; pixel_ptr += 2; @@ -622,7 +627,7 @@ static int flic_decode_frame_15_16BPP(AVCodecContext *avctx, } } else { /* copy pixels if byte_run < 0 */ byte_run = -byte_run; - CHECK_PIXEL_PTR(byte_run); + CHECK_PIXEL_PTR(2 * byte_run); for (j = 0; j < byte_run; j++) { *((signed short*)(&pixels[pixel_ptr])) = AV_RL16(&buf[stream_ptr]); stream_ptr += 2; |