avfilter/all: propagate errors of functions from avfilter/formats

Many of the functions from avfilter/formats can return errors, usually AVERROR(ENOMEM).
This propagates the return values.

All of these were found by using av_warn_unused_result, demonstrating its utility.

Tested with FATE. I am least sure of the changes to avfilter/filtergraph,
since I don't know what/how reduce_format is intended to behave and how it should
react to errors.

Fixes: CID 1325680, 1325679, 1325678.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Previous version Reviewed-by: Nicolas George <george@nsup.org>
Previous version Reviewed-by: Clément Bœsch <u@pkh.me>
Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/libavfilter/vf_palettegen.c b/libavfilter/vf_palettegen.c
index 025bb53589..df57c10982 100644
--- a/libavfilter/vf_palettegen.c
+++ b/libavfilter/vf_palettegen.c
@@ -92,6 +92,7 @@ static int query_formats(AVFilterContext *ctx)
 {
     static const enum AVPixelFormat in_fmts[]  = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
     static const enum AVPixelFormat out_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
+    int ret;
     AVFilterFormats *in  = ff_make_format_list(in_fmts);
     AVFilterFormats *out = ff_make_format_list(out_fmts);
     if (!in || !out) {
@@ -99,8 +100,9 @@ static int query_formats(AVFilterContext *ctx)
         av_freep(&out);
         return AVERROR(ENOMEM);
     }
-    ff_formats_ref(in,  &ctx->inputs[0]->out_formats);
-    ff_formats_ref(out, &ctx->outputs[0]->in_formats);
+    if ((ret = ff_formats_ref(in , &ctx->inputs[0]->out_formats)) < 0 ||
+        (ret = ff_formats_ref(out, &ctx->outputs[0]->in_formats)) < 0)
+        return ret;
     return 0;
 }