dvd-sector-copy.c: Check more carefully for overflow conditions.

diff --git a/dvd-sector-copy.c b/dvd-sector-copy.c
index 177ce94..5c2c46b 100644 (file)
--- a/dvd-sector-copy.c
+++ b/dvd-sector-copy.c
@@ -531,7 +531,7 @@ static ssize_t recovery_read_sectors(struct recoverybuf *r,
 {
   ssize_t n;
 
-  assert(off + want <= r->sz);
+  assert(off <= r->sz); assert(want <= r->sz - off);
   n = read_sectors(pos, r->buf + off*SECTORSZ, want);
   return (n);
 }