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ffmdec: reject zero-sized chunks

Browse Source 
If size is zero, avio_get_str fails, leaving the buffer uninitialized.
This causes invalid reads in av_set_options_string.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
(cherry picked from commit a611375db532c3d5363d97b10fadd0211811a4fd)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Andreas Cadhalpun 2015-12-02 22:47:12 +01:00
parent 26e98f9ae5
commit e1b38b3685
1 changed files with 2 additions and 2 deletions
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4
libavformat/ffmdec.c
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@ -414,7 +414,7 @@ static int ffm2_read_header(AVFormatContext *s)
}
break;
case MKBETAG('S', '2', 'V', 'I'):
if (f_stvi++) {
if (f_stvi++ || !size) {
ret = AVERROR(EINVAL);
goto fail;
}
@ -429,7 +429,7 @@ static int ffm2_read_header(AVFormatContext *s)
goto fail;
break;
case MKBETAG('S', '2', 'A', 'U'):
if (f_stau++) {
if (f_stau++ || !size) {
ret = AVERROR(EINVAL);
goto fail;
}