[FFmpeg-cvslog] avcodec/vaapi_encode: Check hwctx

[Michael Niedermayer]

ffmpeg | branch: release/4.2 | Michael Niedermayer <michael at niedermayer.cc> | Fri Jul 19 22:29:15 2024 +0200| [4e5b5a06d728acb5ba1e298b4530a0ad9ba1d0fd] | committer: Michael Niedermayer

avcodec/vaapi_encode: Check hwctx

Fixes: null pointer dereference
Fixes: 70376/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_VAAPI_fuzzer-4733551250046976

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 3cd077e2820679e8b9f8eb10954b4f5701191c48)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=4e5b5a06d728acb5ba1e298b4530a0ad9ba1d0fd
---

 libavcodec/vaapi_encode.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/vaapi_encode.c b/libavcodec/vaapi_encode.c
index dd2a24de04..707cb63f7e 100644
--- a/libavcodec/vaapi_encode.c
+++ b/libavcodec/vaapi_encode.c
@@ -2253,12 +2253,14 @@ av_cold int ff_vaapi_encode_close(AVCodecContext *avctx)
     av_buffer_pool_uninit(&ctx->output_buffer_pool);
 
     if (ctx->va_context != VA_INVALID_ID) {
-        vaDestroyContext(ctx->hwctx->display, ctx->va_context);
+        if (ctx->hwctx)
+            vaDestroyContext(ctx->hwctx->display, ctx->va_context);
         ctx->va_context = VA_INVALID_ID;
     }
 
     if (ctx->va_config != VA_INVALID_ID) {
-        vaDestroyConfig(ctx->hwctx->display, ctx->va_config);
+        if (ctx->hwctx)
+            vaDestroyConfig(ctx->hwctx->display, ctx->va_config);
         ctx->va_config = VA_INVALID_ID;
     }