From: Mark Wooding <mdw@distorted.org.uk>
Date: Sat, 19 Feb 2022 11:53:22 +0000 (+0000)
Subject: dvd-sector-copy.c: Limit `recovery_read' return value to length requested.
X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~mdw/git/dvdrip/commitdiff_plain/d1105ba703454450ea52af0a22a6b3ac9d355436

dvd-sector-copy.c: Limit `recovery_read' return value to length requested.

Otherwise the caller gets properly confused.
---

diff --git a/dvd-sector-copy.c b/dvd-sector-copy.c
index 4d44122..86540e0 100644
--- a/dvd-sector-copy.c
+++ b/dvd-sector-copy.c
@@ -663,6 +663,7 @@ static ssize_t recovery_read(struct recoverybuf *r,
 
   n = r->pos + r->end - pos;
   if (!n && want) n = -1;
+  else if (n > want) n = want;
 
 end:
 #ifdef DEBUG