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diff --git a/third_party/libopenjpeg20/jp2.c b/third_party/libopenjpeg20/jp2.c
index a6648f6..8128d98 100644
--- a/third_party/libopenjpeg20/jp2.c
+++ b/third_party/libopenjpeg20/jp2.c
@@ -972,6 +972,14 @@ static void opj_jp2_apply_pclr(opj_image_t *image, opj_jp2_color_t *color)
nr_channels = color->jp2_pclr->nr_channels;
old_comps = image->comps;
+ /* Overflow check: prevent integer overflow */
+ for (i = 0; i < nr_channels; ++i) {
+ cmp = cmap[i].cmp;
+ if (old_comps[cmp].h == 0 || old_comps[cmp].w > ((OPJ_UINT32)-1) / sizeof(OPJ_INT32) / old_comps[cmp].h) {
+ return;
+ }
+ }
+
new_comps = (opj_image_comp_t*)
opj_malloc(nr_channels * sizeof(opj_image_comp_t));
if (!new_comps) {
@@ -1011,22 +1019,28 @@ static void opj_jp2_apply_pclr(opj_image_t *image, opj_jp2_color_t *color)
/* Palette mapping: */
cmp = cmap[i].cmp; pcol = cmap[i].pcol;
src = old_comps[cmp].data;
- assert( src );
+ dst = new_comps[i].data;
max = new_comps[i].w * new_comps[i].h;
+ /* Prevent null pointer access */
+ if (!src || !dst) {
+ for (j = 0; j < nr_channels; ++j) {
+ opj_free(new_comps[j].data);
+ }
+ opj_free(new_comps);
+ new_comps = NULL;
+ return;
+ }
+
/* Direct use: */
if(cmap[i].mtyp == 0) {
assert( cmp == 0 ); // probably wrong.
- dst = new_comps[i].data;
- assert( dst );
for(j = 0; j < max; ++j) {
dst[j] = src[j];
}
}
else {
assert( i == pcol ); // probably wrong?
- dst = new_comps[i].data;
- assert( dst );
for(j = 0; j < max; ++j) {
/* The index */
if((k = src[j]) < 0) k = 0; else if(k > top_k) k = top_k;
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