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cmdutils: fix crash if no name for "ffmpeg -h protocol"

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fix crash when used the command like:
- ffmpeg -h protocol
- ffmpeg -h protocol=

Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
Jun Zhao
2020-01-30 22:03:17 +08:00
committed by James Almer
parent 863accbefa
commit b99ed6e428
1 changed files with 7 additions and 1 deletions
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8
fftools/cmdutils.c
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@@ -1872,8 +1872,14 @@ static void show_help_demuxer(const char *name)
static void show_help_protocol(const char *name) static void show_help_protocol(const char *name)
{ {
const AVClass *proto_class = avio_protocol_get_class(name); const AVClass *proto_class;
if (!name) {
av_log(NULL, AV_LOG_ERROR, "No protocol name specified.\n");
return;
}
proto_class = avio_protocol_get_class(name);
if (!proto_class) { if (!proto_class) {
av_log(NULL, AV_LOG_ERROR, "Unknown protocol '%s'.\n", name); av_log(NULL, AV_LOG_ERROR, "Unknown protocol '%s'.\n", name);
return; return;