From: James Almer <jamrial@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH] avcodec/get_bits: don't shift more bits than available in an unsigned with get_leb()
Date: Tue, 30 Jan 2024 19:34:56 -0300
Message-ID: <8e3f60bc-1740-451d-9f62-9e004c72604f@gmail.com> (raw)
In-Reply-To: <AS8P250MB074408C79280FCE3C7D44E3C8F7D2@AS8P250MB0744.EURP250.PROD.OUTLOOK.COM>
On 1/30/2024 7:19 PM, Andreas Rheinhardt wrote:
> James Almer:
>> Signed-off-by: James Almer <jamrial@gmail.com>
>> ---
>> libavcodec/get_bits.h | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/libavcodec/get_bits.h b/libavcodec/get_bits.h
>> index 9e19d2a439..c0cc7c0a7d 100644
>> --- a/libavcodec/get_bits.h
>> +++ b/libavcodec/get_bits.h
>> @@ -725,7 +725,7 @@ static inline unsigned get_leb(GetBitContext *s) {
>> int byte = get_bits(s, 8);
>> unsigned bits = byte & 0x7f;
>> more = byte & 0x80;
>> - if (i <= 4)
>> + if (i <= 3 || (i == 4 && bits < (1 << 4)))
>> leb |= bits << (i * 7);
>> if (++i == 8)
>> break;
>
> This truncates more bits than necessary, which is IMO against the
> documentation of this function.
Mmh, true. I'll just leave it as is then. So patch withdrawn.
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prev parent reply other threads:[~2024-01-30 22:34 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-30 22:16 James Almer
2024-01-30 22:19 ` Andreas Rheinhardt
2024-01-30 22:34 ` James Almer [this message]
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