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1diff --git a/third_party/libopenjpeg20/t1.c b/third_party/libopenjpeg20/t1.c
2index a119db1f7..1ad850c77 100644
3--- a/third_party/libopenjpeg20/t1.c
4+++ b/third_party/libopenjpeg20/t1.c
5@@ -1411,7 +1411,7 @@ static OPJ_BOOL opj_t1_decode_cblk(opj_t1_t *t1,
6             }
7                }
8
9-               for (passno = 0; passno < seg->real_num_passes; ++passno) {
10+               for (passno = 0; (passno < seg->real_num_passes) && (bpno_plus_one >= 1); ++passno) {
11             switch (passtype) {
12                 case 0:
13                     if (type == T1_TYPE_RAW) {
14