[FFmpeg-devel] [PATCH] avutil/dict: fix memleak in av_dict_set()

[Michael Niedermayer]

Hi James

On Mon, Apr 07, 2025 at 07:45:23PM -0300, James Almer wrote:
> Regression since 19e9a203b7b8e613840b055cdf68303a4fb84581.
> 
> Signed-off-by: James Almer <jamrial at gmail.com>
> ---
>  libavutil/dict.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/libavutil/dict.c b/libavutil/dict.c
> index f7dcd07eeb..fafb454fd3 100644
> --- a/libavutil/dict.c
> +++ b/libavutil/dict.c
> @@ -99,27 +99,28 @@ int av_dict_set(AVDictionary **pm, const char *key, const char *value,
>          err = AVERROR(EINVAL);
>          goto err_out;
>      }
> +    if (flags & AV_DICT_DONT_STRDUP_KEY)
> +        copy_key = (void *)key;
> +    else
> +        copy_key = av_strdup(key);
> +    if (!copy_key || (value && !copy_value))
> +        goto enomem;
> +
>      if (!(flags & AV_DICT_MULTIKEY)) {
>          tag = av_dict_get(m, key, NULL, flags);
>      } else if (flags & AV_DICT_DEDUP) {
>          while ((tag = av_dict_get(m, key, tag, flags))) {
>              if ((!value && !tag->value) ||
>                  (value && tag->value && !strcmp(value, tag->value))) {
> -                if (flags & AV_DICT_DONT_STRDUP_KEY)
> -                    av_free((void*)key);
> -                if (flags & AV_DICT_DONT_STRDUP_VAL)
> -                    av_free((void*)value);
> +                av_free(copy_key);
> +                av_free(copy_value);
>                  return 0;
>              }
>          }
>      }
> -    if (flags & AV_DICT_DONT_STRDUP_KEY)
> -        copy_key = (void *)key;
> -    else
> -        copy_key = av_strdup(key);

Should be ok
Maybe slightly better if the strdup isnt moved up as theres
a case then where we strdup and free it.

thx

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Those who are best at talking, realize last or never when they are wrong.
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