https://sources.debian.org/patches/fuseiso/20070708-3.2/03-prevent-integer-overflow.patch/
https://bugs.gentoo.org/713328
----
Description: Prevent integer overflow in ZISO code
Author: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

--- a/src/isofs.c
+++ b/src/isofs.c
@@ -1618,6 +1618,10 @@
 };
 
 static int isofs_real_read_zf(isofs_inode *inode, char *out_buf, size_t size, off_t offset) {
+    if( inode->zf_block_shift > 17 ) {
+        fprintf(stderr, "isofs_real_read_zf: can't handle ZF block size of 2^%d\n", inode->zf_block_shift);
+        return -EIO;
+    }
     int zf_block_size = 1 << inode->zf_block_shift;
     int zf_start = offset / zf_block_size;
     int zf_end = (offset + size) / zf_block_size;