avcodec/jpeg2000dec: Check nonzerobits more completely
authorMichael Niedermayer <michael@niedermayer.cc>
Fri, 16 Jun 2017 17:57:08 +0000 (19:57 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Fri, 16 Jun 2017 18:32:39 +0000 (20:32 +0200)
Fixes: runtime error: shift exponent 36 is too large for 32-bit type 'int'
Fixes: 2239/clusterfuzz-testcase-minimized-5639766592716800

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
libavcodec/jpeg2000dec.c

index 09b7293..c3d2747 100644 (file)
@@ -960,9 +960,9 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
             if (!cblk->npasses) {
                 int v = expn[bandno] + numgbits - 1 -
                         tag_tree_decode(s, prec->zerobits + cblkno, 100);
-                if (v < 0) {
+                if (v < 0 || v > 30) {
                     av_log(s->avctx, AV_LOG_ERROR,
-                           "nonzerobits %d invalid\n", v);
+                           "nonzerobits %d invalid or unsupported\n", v);
                     return AVERROR_INVALIDDATA;
                 }
                 cblk->nonzerobits = v;