ffprobe: fix crash in case -of is specified with an empty string

Fix trac issue #5957.

(cherry picked from commit 427a47abcddab15e10ce26d971f712d90c53884b)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/ffprobe.c b/ffprobe.c
index a2980b338c..79fe296489 100644
--- a/ffprobe.c
+++ b/ffprobe.c
@@ -3311,6 +3311,12 @@ int main(int argc, char **argv)
         goto end;
     }
     w_name = av_strtok(print_format, "=", &buf);
+    if (!w_name) {
+        av_log(NULL, AV_LOG_ERROR,
+               "No name specified for the output format\n");
+        ret = AVERROR(EINVAL);
+        goto end;
+    }
     w_args = buf;
 
     if (show_data_hash) {