Re: [FFmpeg-devel] [PATCH] fftools/ffmpeg_mux_init: fix memory leak in ffmpeg_mux_init.c

[James Almer <jamrial@gmail.com>]

On 4/12/2024 1:44 PM, LuMingYin wrote:
> Signed-off-by: LuMingYin <lumingyindetect@163.com>
> ---
>   fftools/ffmpeg_mux_init.c | 7 ++++---
>   libavutil/mem.c           | 5 ++++-
>   2 files changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/fftools/ffmpeg_mux_init.c b/fftools/ffmpeg_mux_init.c
> index 6d8bd5bcdf..e7e2281bd0 100644
> --- a/fftools/ffmpeg_mux_init.c
> +++ b/fftools/ffmpeg_mux_init.c
> @@ -2851,9 +2851,10 @@ static int parse_forced_key_frames(void *log, KeyframeForceCtx *kf,
>   
>               if (nb_ch > INT_MAX - size ||
>                   !(pts = av_realloc_f(pts, size += nb_ch - 1,
> -                                     sizeof(*pts))))
> -                return AVERROR(ENOMEM);
> -
> +                                     sizeof(*pts)))) {
> +                ret = AVERROR(ENOMEM);
> +                goto fail;
> +            }
>               if (p[8]) {
>                   ret = av_parse_time(&t, p + 8, 1);
>                   if (ret < 0) {
> diff --git a/libavutil/mem.c b/libavutil/mem.c
> index b205d3fb25..7f34765fe7 100644
> --- a/libavutil/mem.c
> +++ b/libavutil/mem.c
> @@ -177,11 +177,14 @@ void *av_realloc_f(void *ptr, size_t nelem, size_t elsize)
>   
>       if (size_mult(elsize, nelem, &size)) {
>           av_free(ptr);
> +        ptr = NULL;
>           return NULL;
>       }
>       r = av_realloc(ptr, size);
> -    if (!r)
> +    if (!r) {
>           av_free(ptr);
> +        ptr = NULL;
> +    }

This doesn't do what you think it does. ptr is a local variable in this 
scope. Setting it to NULL will not be reflected in ffmpeg_mux_init.c
And even if it did, it would be an unexpected behavior change in a 
public API function.

>       return r;
>   }
>   
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