[FFmpeg-cvslog] avutil/tx: add null pointer check after av_mallocz

[Steven Liu]

ffmpeg | branch: master | Steven Liu <liuqi05 at kuaishou.com> | Fri Jan 28 10:08:18 2022 +0800| [9887ec3e9bf81ad7680539d9361187dc4bcd2fb3] | committer: Lynne

avutil/tx: add null pointer check after av_mallocz

Fix CID: 1497863
there will get null pointer in attempt to initialize each if alloc memory failed.

Signed-off-by: Steven Liu <liuqi05 at kuaishou.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9887ec3e9bf81ad7680539d9361187dc4bcd2fb3
---

 libavutil/tx.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/libavutil/tx.c b/libavutil/tx.c
index 50616adba7..06e8958283 100644
--- a/libavutil/tx.c
+++ b/libavutil/tx.c
@@ -565,8 +565,13 @@ av_cold int ff_tx_init_subtx(AVTXContext *s, enum AVTXType type,
         print_cd_info(cd_matches[i].cd, cd_matches[i].prio, 1);
     }
 
-    if (!s->sub)
+    if (!s->sub) {
         s->sub = sub = av_mallocz(TX_MAX_SUB*sizeof(*sub));
+        if (!sub) {
+            ret = AVERROR(ENOMEM);
+            goto end;
+        }
+    }
 
     /* Attempt to initialize each */
     for (int i = 0; i < nb_cd_matches; i++) {