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[FFmpeg-devel,2/2] avformat/aadec: Check for scanf() failure

Message ID 20190416222155.31323-2-michael@niedermayer.cc
State Accepted
Commit ed188f6dcdf0935c939ed813cf8745d50742014b
Headers show

Commit Message

Michael Niedermayer April 16, 2019, 10:21 p.m. UTC 
Fixes: use of uninitialized variables
Fixes: blank.aa

Found-by: Chamal De Silva <chamal.desilva@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/aadec.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
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Patch

diff --git a/libavformat/aadec.c b/libavformat/aadec.c
index dc94061dcf..b9dd51ebfc 100644
--- a/libavformat/aadec.c
+++ b/libavformat/aadec.c
@@ -85,6 +85,7 @@  static int aa_read_header(AVFormatContext *s)
     AADemuxContext *c = s->priv_data;
     AVIOContext *pb = s->pb;
     AVStream *st;
+    int ret;
 
     /* parse .aa header */
     avio_skip(pb, 4); // file size
@@ -118,8 +119,12 @@  static int aa_read_header(AVFormatContext *s)
             header_seed = atoi(val);
         } else if (!strcmp(key, "HeaderKey")) { // this looks like "1234567890 1234567890 1234567890 1234567890"
             av_log(s, AV_LOG_DEBUG, "HeaderKey is <%s>\n", val);
-            sscanf(val, "%"SCNu32"%"SCNu32"%"SCNu32"%"SCNu32,
+
+            ret = sscanf(val, "%"SCNu32"%"SCNu32"%"SCNu32"%"SCNu32,
                    &header_key_part[0], &header_key_part[1], &header_key_part[2], &header_key_part[3]);
+            if (ret != 4)
+                return AVERROR_INVALIDDATA;
+
             for (idx = 0; idx < 4; idx++) {
                 AV_WB32(&header_key[idx * 4], header_key_part[idx]); // convert each part to BE!
             }