Re: [FFmpeg-devel] [PATCH v3 1/3] fftools/ffmpeg_filter: fix NULL pointer dereference

From: Anton Khirnov <anton@khirnov.net>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Cc: Zhao Zhili <zhilizhao@tencent.com>
Subject: Re: [FFmpeg-devel] [PATCH v3 1/3] fftools/ffmpeg_filter: fix NULL pointer dereference
Date: Wed, 20 Dec 2023 10:50:01 +0100
Message-ID: <170306580121.8914.14203941487199917687@lain.khirnov.net> (raw)
In-Reply-To: <tencent_136075DD89054EA06550D318084073EB3305@qq.com>

Quoting Zhao Zhili (2023-12-20 11:26:22)
> From: Zhao Zhili <zhilizhao@tencent.com>
> 
> In close_output(), a dummy frame is created with format NONE passed
> to enc_open(), which isn't prepared for it. The NULL pointer
> dereference happened at
> av_pix_fmt_desc_get(enc_ctx->pix_fmt)->comp[0].depth.
> 
> When fgt.graph is NULL, skip fg_output_frame() since there is
> nothing to output.
> 
> frame #0: 0x0000005555bc34a4 ffmpeg_g`enc_open(opaque=0xb400007efe2db690, frame=0xb400007efe2d9f70) at ffmpeg_enc.c:235:44
> frame #1: 0x0000005555bef250 ffmpeg_g`enc_open(sch=0xb400007dde2d4090, enc=0xb400007e4e2daad0, frame=0xb400007efe2d9f70) at ffmpeg_sched.c:1462:11
> frame #2: 0x0000005555bee094 ffmpeg_g`send_to_enc(sch=0xb400007dde2d4090, enc=0xb400007e4e2daad0, frame=0xb400007efe2d9f70) at ffmpeg_sched.c:1571:19
> frame #3: 0x0000005555bee01c ffmpeg_g`sch_filter_send(sch=0xb400007dde2d4090, fg_idx=0, out_idx=0, frame=0xb400007efe2d9f70) at ffmpeg_sched.c:2154:12
> frame #4: 0x0000005555bcf124 ffmpeg_g`close_output(ofp=0xb400007e4e2d85b0, fgt=0x0000007d1790eb08) at ffmpeg_filter.c:2225:15
> frame #5: 0x0000005555bcb000 ffmpeg_g`fg_output_frame(ofp=0xb400007e4e2d85b0, fgt=0x0000007d1790eb08, frame=0x0000000000000000) at ffmpeg_filter.c:2317:16
> frame #6: 0x0000005555bc7e48 ffmpeg_g`filter_thread(arg=0xb400007eae2ce7a0) at ffmpeg_filter.c:2836:15
> frame #7: 0x0000005555bee568 ffmpeg_g`task_wrapper(arg=0xb400007d8e2db478) at ffmpeg_sched.c:2200:21
> ---
>  fftools/ffmpeg_filter.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fftools/ffmpeg_filter.c b/fftools/ffmpeg_filter.c
> index 9fc877b437..f175ca7918 100644
> --- a/fftools/ffmpeg_filter.c
> +++ b/fftools/ffmpeg_filter.c
> @@ -2835,7 +2835,7 @@ read_frames:
>      for (unsigned i = 0; i < fg->nb_outputs; i++) {
>          OutputFilterPriv *ofp = ofp_from_ofilter(fg->outputs[i]);
>  
> -        if (fgt.eof_out[i])
> +        if (fgt.eof_out[i] || !fgt.graph)

Ok

Thanks for fixing this,
-- 
Anton Khirnov
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