diff options
Diffstat (limited to 'libavcodec/movtextenc.c')
| -rw-r--r-- | libavcodec/movtextenc.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/libavcodec/movtextenc.c b/libavcodec/movtextenc.c index 7f1b5b830f..9b0a6c5bce 100644 --- a/libavcodec/movtextenc.c +++ b/libavcodec/movtextenc.c @@ -21,6 +21,7 @@ #include <stdarg.h> #include "avcodec.h" +#include "libavutil/avassert.h" #include "libavutil/avstring.h" #include "libavutil/intreadwrite.h" #include "ass_split.h" @@ -87,15 +88,18 @@ static av_cold int mov_text_encode_init(AVCodecContext *avctx) static void mov_text_text_cb(void *priv, const char *text, int len) { MovTextContext *s = priv; + av_assert0(s->end >= s->ptr); av_strlcpy(s->ptr, text, FFMIN(s->end - s->ptr, len + 1)); - s->ptr += len; + s->ptr += FFMIN(s->end - s->ptr, len); } static void mov_text_new_line_cb(void *priv, int forced) { MovTextContext *s = priv; + av_assert0(s->end >= s->ptr); av_strlcpy(s->ptr, "\n", FFMIN(s->end - s->ptr, 2)); - s->ptr++; + if (s->end > s->ptr) + s->ptr++; } static const ASSCodesCallbacks mov_text_callbacks = { |