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Code Issues Releases Activity

avfilter/vf_paletteuse: Fix leaks of AVFilterFormats on error

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The paletteuse's query_formats function allocated three AVFilterFormats
before storing them permanently. If allocating one of them failed, the
three AVFilterFormats structures would be freed with av_freep() which
does not free separately allocated subelements (namely the formats
array) which leak.

Furthermore, if storing one of the first two fails, the function simply
returns and the ones not yet stored leak.

These leaks have been fixed by only creating a new AVFilterFormats after
the last one has already been permanently stored. Furthermore, it is
enough to check whether the elements have been properly stored as
ff_formats_ref() by design returns AVERROR(ENOMEM) if it is provided a
NULL AVFilterFormats *.

Fixes Coverity issues #1270818 and #1270819.

Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-08-07 06:09:59 +02:00
parent deb6476fd8
commit 6a65449954
1 changed files with 6 additions and 12 deletions
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18
libavfilter/vf_paletteuse.c
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@ -142,18 +142,12 @@ static int query_formats(AVFilterContext *ctx)
static const enum AVPixelFormat inpal_fmts[] = {AV_PIX_FMT_RGB32, AV_PIX_FMT_NONE};
static const enum AVPixelFormat out_fmts[] = {AV_PIX_FMT_PAL8, AV_PIX_FMT_NONE};
int ret;
AVFilterFormats *in = ff_make_format_list(in_fmts);
AVFilterFormats *inpal = ff_make_format_list(inpal_fmts);
AVFilterFormats *out = ff_make_format_list(out_fmts);
if (!in || !inpal || !out) {
av_freep(&in);
av_freep(&inpal);
av_freep(&out);
return AVERROR(ENOMEM);
}
if ((ret = ff_formats_ref(in , &ctx->inputs[0]->out_formats)) < 0 ||
(ret = ff_formats_ref(inpal, &ctx->inputs[1]->out_formats)) < 0 ||
(ret = ff_formats_ref(out , &ctx->outputs[0]->in_formats)) < 0)
if ((ret = ff_formats_ref(ff_make_format_list(in_fmts),
&ctx->inputs[0]->out_formats)) < 0 ||
(ret = ff_formats_ref(ff_make_format_list(inpal_fmts),
&ctx->inputs[1]->out_formats)) < 0 ||
(ret = ff_formats_ref(ff_make_format_list(out_fmts),
&ctx->outputs[0]->in_formats)) < 0)
return ret;
return 0;
}