From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH 4/6] avcodec/jrevdct: Fix UB left shifts of negative numbers
Date: Thu, 29 Sep 2022 20:08:38 +0200
Message-ID: <GV1P250MB0737867C5F2420120D3FAE0F8F579@GV1P250MB0737.EURP250.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20220929180410.GE6583@pb2>
Michael Niedermayer:
> On Wed, Sep 28, 2022 at 08:58:16PM +0200, Andreas Rheinhardt wrote:
>> Affected the rv20-1239 FATE test.
>>
>> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
>> ---
>> libavcodec/jrevdct.c | 38 +++++++++++++++++++-------------------
>> 1 file changed, 19 insertions(+), 19 deletions(-)
>
> iam a bit surprised this was not spotted long ago but LGTM
>
> thx
>
Most of these changes are in ff_j_rev_dct4 which is only used if lowres
== 1; I guess the fuzzer doesn't use lowres which explains why this has
not been found before.
- Andreas
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next prev parent reply other threads:[~2022-09-29 18:08 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-28 18:56 [FFmpeg-devel] [PATCH 1/6] avcodec/g723_1enc: Remove unnecessary av_clipl_int32() Andreas Rheinhardt
2022-09-28 18:58 ` [FFmpeg-devel] [PATCH 2/6] avcodec/g723_1enc: Fix undefined left-shifts of negative numbers Andreas Rheinhardt
2022-09-28 18:58 ` [FFmpeg-devel] [PATCH 3/6] avformat/aviobuf: Don't use NULL as src for memcpy Andreas Rheinhardt
2022-09-28 20:46 ` James Almer
2022-09-28 20:49 ` Andreas Rheinhardt
2022-09-28 18:58 ` [FFmpeg-devel] [PATCH 4/6] avcodec/jrevdct: Fix UB left shifts of negative numbers Andreas Rheinhardt
2022-09-29 18:04 ` Michael Niedermayer
2022-09-29 18:08 ` Andreas Rheinhardt [this message]
2022-09-28 18:58 ` [FFmpeg-devel] [PATCH 5/6] avcodec/mpegvideo: Fix undefined left shift " Andreas Rheinhardt
2022-09-29 18:01 ` Michael Niedermayer
2022-09-28 18:58 ` [FFmpeg-devel] [PATCH 6/6] avcodec/mpegvideo_dec: Fix UB NULL + 0 Andreas Rheinhardt
2022-10-02 17:17 ` [FFmpeg-devel] [PATCH 1/6] avcodec/g723_1enc: Remove unnecessary av_clipl_int32() Andreas Rheinhardt
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