src/java.base/share/native/libzip/zip_util.c

@@ -1300,16 +1300,27 @@
  * has the size bigger than 2**32 bytes in ONE invocation.
  */
 jint
 ZIP_Read(jzfile *zip, jzentry *entry, jlong pos, void *buf, jint len)
 {
-    jlong entry_size = (entry->csize != 0) ? entry->csize : entry->size;
+    jlong entry_size;
     jlong start;
 
+    if (zip == 0) {
+        return -1;
+    }
+
     /* Clear previous zip error */
     zip->msg = NULL;
 
+    if (entry == 0) {
+        zip->msg = "ZIP_Read: jzentry is NULL";
+        return -1;
+    }
+
+    entry_size = (entry->csize != 0) ? entry->csize : entry->size;
+
     /* Check specified position */
     if (pos < 0 || pos > entry_size - 1) {
         zip->msg = "ZIP_Read: specified offset out of range";
         return -1;
     }

@@ -1438,10 +1449,15 @@
 ZIP_ReadEntry(jzfile *zip, jzentry *entry, unsigned char *buf, char *entryname)
 {
     char *msg;
     char tmpbuf[1024];
 
+    if (entry == 0) {
+        jio_fprintf(stderr, "jzentry was invalid");
+        return JNI_FALSE;
+    }
+
     strcpy(entryname, entry->name);
     if (entry->csize == 0) {
         /* Entry is stored */
         jlong pos = 0;
         jlong size = entry->size;