opj_tcd_dc_level_shift_decode(): avoid increment nullptr (fixes #1480)

(likely harmless issue as we don't dereference it)

diff --git a/src/lib/openjp2/tcd.c b/src/lib/openjp2/tcd.c
index 438247b60217a95f0e378bddcd9a661a3f7b79a0..b2375146de049537992eec62f67b732c1cc31084 100644 (file)
--- a/src/lib/openjp2/tcd.c
+++ b/src/lib/openjp2/tcd.c
@@ -2315,6 +2315,9 @@ static OPJ_BOOL opj_tcd_dc_level_shift_decode(opj_tcd_t *p_tcd)
             l_max = (OPJ_INT32)((1U << l_img_comp->prec) - 1);
         }
 
+        if (l_width == 0 || l_height == 0) {
+            continue;
+        }
 
         if (l_tccp->qmfbid == 1) {
             for (j = 0; j < l_height; ++j) {