[FFmpeg-devel] [PATCH] avcodec/libwebpenc_animencoder: Fix memory leak of WebPData in libwebp_anim_encode_frame()

[Andrey Volk <andywolk@gmail.com>]

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A fix attached.

```
==37349==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 153770 byte(s) in 1 object(s) allocated from:
    #0 0x7fa249785330 in __interceptor_malloc
(/usr/lib/x86_64-linux-gnu/libasan.so.5+0xe9330)
    #1 0x7fa245c41e59 in WebPMuxAssemble
/libwebp-0.6.1/src/mux/muxedit.c:628
    #2 0x7fa245c4103e in WebPAnimEncoderAssemble
/libwebp-0.6.1/src/mux/anim_encode.c:1562
    #3 0x7fa2485774f9 in libwebp_anim_encode_frame
libavcodec/libwebpenc_animencoder.c:68
    #4 0x7fa24833a6ac in encode_simple_internal libavcodec/encode.c:214
    #5 0x7fa24833a6ac in encode_simple_receive_packet
libavcodec/encode.c:275
    #6 0x7fa24833a6ac in encode_receive_packet_internal
libavcodec/encode.c:309
    #7 0x7fa24833abf8 in avcodec_send_frame libavcodec/encode.c:387
    #8 0x7fa24833af1c in compat_encode libavcodec/encode.c:439
    #9 0x7fa24833b1a5 in avcodec_encode_video2
(/usr/local/ffmpeg/lib/x86_64-linux-gnu/libavcodec.so.58+0x2bb1a5)
```

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From: Andrey Volk <andywolk@gmail.com>
To: ffmpeg-devel@ffmpeg.org
Subject: [PATCH] avcodec/libwebpenc_animencoder: Fix memory leak of WebPData in libwebp_anim_encode_frame()
Date: Wed, 23 Mar 2022 02:28:49 +0300

Signed-off-by: Andrey Volk <andywolk@gmail.com>
---
 libavcodec/libwebpenc_animencoder.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libavcodec/libwebpenc_animencoder.c b/libavcodec/libwebpenc_animencoder.c
index 0f5b524335..29c0d8bb0f 100644
--- a/libavcodec/libwebpenc_animencoder.c
+++ b/libavcodec/libwebpenc_animencoder.c
@@ -70,14 +70,18 @@ static int libwebp_anim_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
             ret = WebPAnimEncoderAssemble(s->enc, &assembled_data);
             if (ret) {
                 ret = ff_get_encode_buffer(avctx, pkt, assembled_data.size, 0);
-                if (ret < 0)
+                if (ret < 0) {
+                    WebPDataClear(&assembled_data);
                     return ret;
+                }
                 memcpy(pkt->data, assembled_data.bytes, assembled_data.size);
+                WebPDataClear(&assembled_data);
                 s->done = 1;
                 pkt->pts = pkt->dts = s->first_frame_pts;
                 *got_packet = 1;
                 return 0;
             } else {
+                WebPDataClear(&assembled_data);
                 av_log(s, AV_LOG_ERROR,
                        "WebPAnimEncoderAssemble() failed with error: %d\n",
                        VP8_ENC_ERROR_OUT_OF_MEMORY);
-- 
2.33.0.windows.2


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