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[FFmpeg-devel] avformat/udp: properly check for valid ttl in url

Message ID 1644230260-31752-1-git-send-email-lance.lmwang@gmail.com
State Accepted
Commit 1de24ee5120b175f38fa42a6b1fbfeeb9f4a50d5
Headers show
Series [FFmpeg-devel] avformat/udp: properly check for valid ttl in url | expand


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Commit Message

Lance Wang Feb. 7, 2022, 10:37 a.m. UTC
From: Limin Wang <lance.lmwang@gmail.com>

Zhao Zhili added a ttl upper bound in commit 9daac85da8,
but the check for ttl in url is missing still.

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
 libavformat/udp.c | 5 +++++
 1 file changed, 5 insertions(+)
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diff --git a/libavformat/udp.c b/libavformat/udp.c
index da56c8e..401d9b6 100644
--- a/libavformat/udp.c
+++ b/libavformat/udp.c
@@ -674,6 +674,11 @@  static int udp_open(URLContext *h, const char *uri, int flags)
         if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
             s->ttl = strtol(buf, NULL, 10);
+            if (s->ttl < 0 || s->ttl > 255) {
+                av_log(h, AV_LOG_ERROR, "ttl(%d) should be in range [0,255]\n", s->ttl);
+                ret = AVERROR(EINVAL);
+                goto fail;
+            }
         if (av_find_info_tag(buf, sizeof(buf), "udplite_coverage", p)) {
             s->udplite_coverage = strtol(buf, NULL, 10);