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avidec: Fix regression with chunks that are larger than the file.

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This commit makes the check specific to the case that needs it.

Regression was introduced by
commit 62adc60b97
Author: Michael Niedermayer <michaelni@gmx.at>
Date:   Fri Dec 16 06:13:04 2011 +0100

    avidec: Check that the header chunks fit in the available filesize.
    Fixes Ticket771
    Bug found by: Diana Elena Muscalu

    Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-01-25 05:21:23 +01:00
parent 59e95fa4a8
commit 28d634711b
1 changed files with 1 additions and 6 deletions
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7
libavformat/avidec.c
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@ -387,11 +387,6 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
tag = avio_rl32(pb);
size = avio_rl32(pb);
if(size > avi->fsize){
av_log(s, AV_LOG_ERROR, "chunk size is too big during header parsing\n");
goto fail;
}
print_tag("tag", tag, size);
switch(tag) {
@ -605,7 +600,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
break;
}
if(size > 10*4 && size<(1<<30)){
if(size > 10*4 && size<(1<<30) && size < avi->fsize){
st->codec->extradata_size= size - 10*4;
st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata) {