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avformat/matroskaenc: Don't use NULL for %s format string 

The argument pertaining to a printf %s conversion specifier must not
be NULL, even if the precision (i.e. the number of characters to write)
is zero. If it is NULL, it is undefined behaviour.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit 6de6ce7bc8)
This commit is contained in:
Andreas Rheinhardt 2020-06-14 03:35:41 +02:00
parent 3f3cfddb37
commit c49dfee90b
1 changed files with 3 additions and 1 deletions
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4
libavformat/matroskaenc.c
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@ -2118,17 +2118,19 @@ static int mkv_write_vtt_blocks(AVFormatContext *s, AVIOContext *pb, const AVPac
mkv_track *track = &mkv->tracks[pkt->stream_index];
ebml_master blockgroup;
int id_size, settings_size, size;
uint8_t *id, *settings;
const char *id, *settings;
int64_t ts = track->write_dts ? pkt->dts : pkt->pts;
const int flags = 0;
id_size = 0;
id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER,
&id_size);
id = id ? id : "";
settings_size = 0;
settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS,
&settings_size);
settings = settings ? settings : "";
size = id_size + 1 + settings_size + 1 + pkt->size;