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avcodec/movtextdec: Reset counter of fonts when freeing them

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If allocating fonts fails when reading the header, all fonts are freed,
yet the counter of fonts is not reset and no error is returned; when
subtitles are decoded lateron, the inexistent list of fonts is searched
for the matching font for this particular entry which of course leads to
a segfault.

Reviewed-by: Philip Langdale <philipl@overt.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt
2020-10-17 10:15:29 +02:00
parent 9860777516
commit 5758620560
1 changed files with 1 additions and 2 deletions
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3
libavcodec/movtextdec.c
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@@ -148,6 +148,7 @@ static void mov_text_cleanup_ftab(MovTextContext *m)
}
}
av_freep(&m->ftab);
m->ftab_entries = 0;
}
static int mov_text_tx3g(AVCodecContext *avctx, MovTextContext *m)
@@ -230,7 +231,6 @@ static int mov_text_tx3g(AVCodecContext *avctx, MovTextContext *m)
box_size += 3;
if (avctx->extradata_size < box_size) {
mov_text_cleanup_ftab(m);
m->ftab_entries = 0;
return -1;
}
m->ftab_temp = av_mallocz(sizeof(*m->ftab_temp));
@@ -245,7 +245,6 @@ static int mov_text_tx3g(AVCodecContext *avctx, MovTextContext *m)
box_size = box_size + font_length;
if (avctx->extradata_size < box_size) {
mov_text_cleanup_ftab(m);
m->ftab_entries = 0;
return -1;
}
m->ftab_temp->font = av_malloc(font_length + 1);