[FFmpeg-cvslog] avformat/hlsplaylist: add return value check of strftime

[Steven Liu]

ffmpeg | branch: master | Steven Liu <lq at chinaffmpeg.org> | Mon Dec  4 12:05:04 2017 +0800| [ad6946b8189e5e17796f1d5bf86d97ee619009b8] | committer: Steven Liu

avformat/hlsplaylist: add return value check of strftime

fix CID: 1424884
Signed-off-by: Steven Liu <lq at chinaffmpeg.org>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ad6946b8189e5e17796f1d5bf86d97ee619009b8
---

 libavformat/hlsplaylist.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavformat/hlsplaylist.c b/libavformat/hlsplaylist.c
index 96a8afbe1d..3349eb7ee3 100644
--- a/libavformat/hlsplaylist.c
+++ b/libavformat/hlsplaylist.c
@@ -109,7 +109,10 @@ int ff_hls_write_file_entry(AVIOContext *out, int insert_discont,
         tt = (int64_t)*prog_date_time;
         milli = av_clip(lrint(1000*(*prog_date_time - tt)), 0, 999);
         tm = localtime_r(&tt, &tmpbuf);
-        strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm);
+        if (!strftime(buf0, sizeof(buf0), "%Y-%m-%dT%H:%M:%S", tm)) {
+            av_log(NULL, AV_LOG_DEBUG, "strftime error in ff_hls_write_file_entry\n");
+            return AVERROR_UNKNOWN;
+        }
         if (!strftime(buf1, sizeof(buf1), "%z", tm) || buf1[1]<'0' ||buf1[1]>'2') {
             int tz_min, dst = tm->tm_isdst;
             tm = gmtime_r(&tt, &tmpbuf);