Fixes: NULL ptr dereference
Fixes: 
26508/clusterfuzz-testcase-minimized-ffmpeg_dem_AAX_fuzzer-5694725249826816

Found-by: continuous fuzzing process 
https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <[email protected]>
---
 libavformat/aaxdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/aaxdec.c b/libavformat/aaxdec.c
index 3db6e9bc6d..7d10e805ca 100644
--- a/libavformat/aaxdec.c
+++ b/libavformat/aaxdec.c
@@ -232,7 +232,7 @@ static int aax_read_header(AVFormatContext *s)
         int64_t col_offset;
         int flag, type;
 
-        if (strcmp(a->xcolumns[c].name, "data"))
+        if (!a->xcolumns[c].name || strcmp(a->xcolumns[c].name, "data"))
             continue;
 
         type = a->xcolumns[c].type;
-- 
2.17.1

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