diff --git a/third_party/libopenjpeg20/j2k.c b/third_party/libopenjpeg20/j2k.c
index 5e1494394..413dbdd9f 100644
--- a/third_party/libopenjpeg20/j2k.c
+++ b/third_party/libopenjpeg20/j2k.c
@@ -10537,6 +10537,10 @@ static OPJ_BOOL opj_j2k_read_SPCod_SPCoc(opj_j2k_t *p_j2k,
             p_j2k->m_specific_param.m_decoder.m_default_tcp;
 
     /* precondition again */
+    if (compno >= p_j2k->m_private_image->numcomps) {
+        return OPJ_FALSE;
+    }
+
     assert(compno < p_j2k->m_private_image->numcomps);
 
     l_tccp = &l_tcp->tccps[compno];