reported by clang-scan analysis
---
libavfilter/af_channelmap.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/libavfilter/af_channelmap.c b/libavfilter/af_channelmap.c
index da83009..9f4f4d0 100644
--- a/libavfilter/af_channelmap.c
+++ b/libavfilter/af_channelmap.c
@@ -92,9 +92,13 @@ static char* split(char *message, char delim) {
static int get_channel_idx(char **map, int *ch, char delim, int max_ch)
{
- char *next = split(*map, delim);
+ char *next;
int len;
int n = 0;
+
+ if (!*map)
+ return AVERROR(EINVAL);
+ next = split(*map, delim);
if (!next && delim == '-')
return AVERROR(EINVAL);
len = strlen(*map);
--
1.7.9.5
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