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avcodec/flicvideo: Make line_packets int

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Fixes: signed integer overflow: -32768 * 196032 cannot be represented in type 'int'
Fixes: 15300/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FLIC_fuzzer-5733319519502336

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 54bd47f861)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2019-06-21 23:01:04 +02:00
parent 0c8edb3d65
commit eeff00c7da
1 changed files with 4 additions and 4 deletions
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8
libavcodec/flicvideo.c
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@@ -178,7 +178,7 @@ static int flic_decode_frame_8BPP(AVCodecContext *avctx,
int lines;
int compressed_lines;
int starting_line;
signed short line_packets;
int line_packets;
int y_ptr;
int byte_run;
int pixel_skip;
@@ -277,7 +277,7 @@ static int flic_decode_frame_8BPP(AVCodecContext *avctx,
break;
if (y_ptr > pixel_limit)
return AVERROR_INVALIDDATA;
line_packets = bytestream2_get_le16(&g2);
line_packets = sign_extend(bytestream2_get_le16(&g2), 16);
if ((line_packets & 0xC000) == 0xC000) {
// line skip opcode
line_packets = -line_packets;
@@ -507,7 +507,7 @@ static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
int lines;
int compressed_lines;
signed short line_packets;
int line_packets;
int y_ptr;
int byte_run;
int pixel_skip;
@@ -571,7 +571,7 @@ static int flic_decode_frame_15_16BPP(AVCodecContext *avctx,
break;
if (y_ptr > pixel_limit)
return AVERROR_INVALIDDATA;
line_packets = bytestream2_get_le16(&g2);
line_packets = sign_extend(bytestream2_get_le16(&g2), 16);
if (line_packets < 0) {
line_packets = -line_packets;
if (line_packets > s->avctx->height)