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avcodec/bintext: sanity check dimensions 

Fixes: Timeout
Fixes: 6277/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XBIN_fuzzer-6047202288861184

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-02-26 21:17:08 +01:00
parent 27cbbbb33f
commit 090c0abff9
1 changed files with 5 additions and 2 deletions
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7
libavcodec/bintext.c
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@ -35,6 +35,8 @@
#include "bintext.h"
#include "internal.h"
#define FONT_WIDTH 8
typedef struct XbinContext {
AVFrame *frame;
int palette[16];
@ -91,6 +93,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
break;
}
}
if (avctx->width < FONT_WIDTH || avctx->height < s->font_height)
return AVERROR_INVALIDDATA;
s->frame = av_frame_alloc();
if (!s->frame)
@ -113,8 +118,6 @@ av_unused static void hscroll(AVCodecContext *avctx)
}
}
#define FONT_WIDTH 8
/**
* Draw character to screen
*/