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avfilter/af_channelmap: Check for missing argument in get_channel_idx()

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Fixes null pointer dereference

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-01-23 15:03:40 +01:00
parent 47372caac5
commit 579795b204
1 changed files with 2 additions and 0 deletions
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2
libavfilter/af_channelmap.c
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@ -93,6 +93,8 @@ static int get_channel_idx(char **map, int *ch, char delim, int max_ch)
int n = 0;
if (!next && delim == '-')
return AVERROR(EINVAL);
if (!*map)
return AVERROR(EINVAL);
len = strlen(*map);
sscanf(*map, "%d%n", ch, &n);
if (n != len)