better handle under/overflow of chunk table in deep tiles

Signed-off-by: Kimball Thurston <kdt3rd@gmail.com>
kdt3rd · Sep 13, 2024 · abd3c0a · abd3c0a
1 parent 3deae27
commit abd3c0a
Showing 1 changed file with 18 additions and 4 deletions.
diff --git a/src/lib/OpenEXRCore/decoding.c b/src/lib/OpenEXRCore/decoding.c
@@ -603,10 +603,24 @@ exr_decoding_run (
 
             if (decode->chunk.sample_count_table_size > 0)
             {
-                memcpy (
-                    decode->sample_count_table,
-                    decode->packed_sample_count_table,
-                    sampsize);
+                if (decode->chunk.sample_count_table_size < sampsize)
+                {
+                    memcpy (
+                        decode->sample_count_table,
+                        decode->packed_sample_count_table,
+                        decode->chunk.sample_count_table_size);
+                    memset (
+                        decode->sample_count_table + (decode->chunk.sample_count_table_size / sizeof(int32_t)),
+                        0,
+                        sampsize - decode->chunk.sample_count_table_size);
+                }
+                else
+                {
+                    memcpy (
+                        decode->sample_count_table,
+                        decode->packed_sample_count_table,
+                        sampsize);
+                }
             }
             else
             {