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diff --git a/src/bin/jp2/convertpng.c b/src/bin/jp2/convertpng.c
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index 00f596e..af3f91e 100644
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--- a/src/bin/jp2/convertpng.c
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+++ b/src/bin/jp2/convertpng.c
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@@ -75,10 +75,10 @@ opj_image_t *pngtoimage(const char *read_idf, opj_cparameters_t * params)
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     png_uint_32  width, height = 0U;
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     int color_type;
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     FILE *reader = NULL;
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-    OPJ_BYTE** rows = NULL;
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-    OPJ_INT32* row32s = NULL;
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+    OPJ_BYTE** volatile rows = NULL;
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+    OPJ_INT32* volatile row32s = NULL;
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     /* j2k: */
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-    opj_image_t *image = NULL;
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+    opj_image_t* volatile image = NULL;
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     opj_image_cmptparm_t cmptparm[4];
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     OPJ_UINT32 nr_comp;
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     OPJ_BYTE sigbuf[8];
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diff --git a/src/bin/jp2/converttif.c b/src/bin/jp2/converttif.c
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index 9d1037a..8d5002a 100644
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--- a/src/bin/jp2/converttif.c
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+++ b/src/bin/jp2/converttif.c
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@@ -720,7 +720,7 @@ int imagetotif(opj_image_t * image, const char *outfile)
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         TIFFClose(tif);
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         return 1;
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     }
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-    rowStride = (int64_t)((width * numcomps * bps + 7U) / 8U);
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+    rowStride = ((int64_t)width * numcomps * bps + 7U) / 8U;
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     if (rowStride != strip_size) {
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         fprintf(stderr, "Invalid TIFF strip size\n");
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         TIFFClose(tif);
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@@ -1283,8 +1283,6 @@ opj_image_t* tiftoimage(const char *filename, opj_cparameters_t *parameters)
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     TIFFGetField(tif, TIFFTAG_SAMPLESPERPIXEL, &tiSpp);
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     TIFFGetField(tif, TIFFTAG_PHOTOMETRIC, &tiPhoto);
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     TIFFGetField(tif, TIFFTAG_PLANARCONFIG, &tiPC);
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-    w = (int)tiWidth;
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-    h = (int)tiHeight;
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     if (tiSpp == 0 || tiSpp > 4) { /* should be 1 ... 4 */
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         fprintf(stderr, "tiftoimage: Bad value for samples per pixel == %d.\n"
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@@ -1451,7 +1449,7 @@ opj_image_t* tiftoimage(const char *filename, opj_cparameters_t *parameters)
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         return NULL;
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     }
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-    rowStride = (int64_t)((tiWidth * tiSpp * tiBps + 7U) / 8U);
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+    rowStride = ((int64_t)tiWidth * tiSpp * tiBps + 7U) / 8U;
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     buffer32s = (OPJ_INT32 *)malloc(sizeof(OPJ_INT32) * tiWidth * tiSpp);
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     if (buffer32s == NULL) {
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         _TIFFfree(buf);
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diff --git a/src/lib/openjp2/j2k.c b/src/lib/openjp2/j2k.c
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index 8e343ab..c13d229 100644
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--- a/src/lib/openjp2/j2k.c
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+++ b/src/lib/openjp2/j2k.c
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@@ -7075,7 +7075,7 @@ static OPJ_BOOL opj_j2k_is_imf_compliant(opj_cparameters_t *parameters,
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     /* Validate sublevel */
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     assert(sizeof(tabMaxSubLevelFromMainLevel) ==
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            (OPJ_IMF_MAINLEVEL_MAX + 1) * sizeof(tabMaxSubLevelFromMainLevel[0]));
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-    if (sublevel > tabMaxSubLevelFromMainLevel[mainlevel]) {
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+    if (mainlevel <= OPJ_IMF_MAINLEVEL_MAX && sublevel > tabMaxSubLevelFromMainLevel[mainlevel]) {
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         opj_event_msg(p_manager, EVT_WARNING,
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                       "IMF profile require sublevel <= %d for mainlevel = %d.\n"
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                       "-> %d is thus not compliant\n"
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diff --git a/src/lib/openjp2/t2.c b/src/lib/openjp2/t2.c
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index 1481e16..d46bfb4 100644
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--- a/src/lib/openjp2/t2.c
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+++ b/src/lib/openjp2/t2.c
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@@ -821,6 +821,7 @@ static OPJ_BOOL opj_t2_encode_packet(OPJ_UINT32 tileno,
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             opj_event_msg(p_manager, EVT_ERROR,
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                           "opj_t2_encode_packet(): accessing precno=%u >= %u\n",
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                           precno, res->pw * res->ph);
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+            opj_bio_destroy(bio);
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             return OPJ_FALSE;
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         }
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