On 11/12/2023 12:11 PM, Sebastian Ramacher wrote:
---
  libavcodec/avfft.c | 6 ++++--
  1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/avfft.c b/libavcodec/avfft.c
index 93203228c2..813b6d61a1 100644
--- a/libavcodec/avfft.c
+++ b/libavcodec/avfft.c
@@ -102,7 +102,8 @@ FFTContext *av_mdct_init(int nbits, int inverse, double 
scale)
              av_free(s);
              return NULL;
          }
-    }
+    } else
+        s->ctx2 = NULL;
return (FFTContext *)s;
  }
@@ -220,7 +221,8 @@ DCTContext *av_dct_init(int nbits, enum DCTTransformType 
inverse)
              av_free(s);
              return NULL;
          }
-    }
+    } else
+        s->tmp = NULL;
return (DCTContext *)s;
  }

IMO just allocate the AVTXWrapper with av_mallocz() instead.
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