[FFmpeg-devel] [PATCH 1/2] libavformat/dashdec: Fix for ticket 7149 (Segfault when decoding dash streams)
Colin NG
colin_ng at hotmail.com
Tue May 1 01:24:13 EEST 2018
- Add NULL pointer check for init_section
---
libavformat/dashdec.c | 30 +++++++++++++++++++++++-------
1 file changed, 23 insertions(+), 7 deletions(-)
diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
index 42202e0..c6f350d 100644
--- a/libavformat/dashdec.c
+++ b/libavformat/dashdec.c
@@ -1877,25 +1877,40 @@ fail:
static int init_section_compare_video(DASHContext *c)
{
+ char *url =NULL;
+ int64_t url_offset = -1;
+ int64_t size = -1;
int i = 0;
- char *url = c->videos[0]->init_section->url;
- int64_t url_offset = c->videos[0]->init_section->url_offset;
- int64_t size = c->videos[0]->init_section->size;
+
+ if (c->videos[0]->init_section == NULL)
+ return 0;
+
+ url = c->videos[0]->init_section->url;
+ url_offset = c->videos[0]->init_section->url_offset;
+ size = c->videos[0]->init_section->size;
for (i=0;i<c->n_videos;i++) {
if (av_strcasecmp(c->videos[i]->init_section->url,url) || c->videos[i]->init_section->url_offset != url_offset || c->videos[i]->init_section->size != size) {
return 0;
}
}
+
return 1;
}
static int init_section_compare_audio(DASHContext *c)
{
+ char *url =NULL;
+ int64_t url_offset = -1;
+ int64_t size = -1;
int i = 0;
- char *url = c->audios[0]->init_section->url;
- int64_t url_offset = c->audios[0]->init_section->url_offset;
- int64_t size = c->audios[0]->init_section->size;
- for (i=0;i<c->n_audios;i++) {
+
+ if (c->audios[0]->init_section == NULL)
+ return 0;
+
+ url = c->audios[0]->init_section->url;
+ url_offset = c->audios[0]->init_section->url_offset;
+ size = c->audios[0]->init_section->size;
+ for (i=0; i<c->n_audios; i++) {
if (av_strcasecmp(c->audios[i]->init_section->url,url) || c->audios[i]->init_section->url_offset != url_offset || c->audios[i]->init_section->size != size) {
return 0;
}
@@ -1960,6 +1975,7 @@ static int dash_read_header(AVFormatContext *s)
++stream_index;
}
+
if (c->n_audios) {
c->is_init_section_common_audio = init_section_compare_audio(c);
}
--
2.7.4
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