[newlib-cygwin/main] Cygwin: mmap_list::try_map: fix a condition in a test of an mmap request

[Ken Brown]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=67bef16f7edf8642366ff55399bf9cf007c66d52

commit 67bef16f7edf8642366ff55399bf9cf007c66d52
Author: Ken Brown <kbrown@cornell.edu>
Date:   Wed Dec 18 11:43:09 2024 -0500

    Cygwin: mmap_list::try_map: fix a condition in a test of an mmap request
    
    In testing whether the requested area is contained in an existing
    mapped region, an incorrect condition was used due to a
    misinterpretation of the u_addr and u_len variables.
    
    Addresses: https://cygwin.com/pipermail/cygwin/2024-December/256913.html
    Fixes: c68de3a262fe5 ("* mmap.cc (class mmap_record):
    Declare new map_pages method with address parameter.")
    Signed-off-by: Ken Brown <kbrown@cornell.edu>

Diff:
---
 winsup/cygwin/mm/mmap.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/winsup/cygwin/mm/mmap.cc b/winsup/cygwin/mm/mmap.cc
index 4fec64b87..13418d782 100644
--- a/winsup/cygwin/mm/mmap.cc
+++ b/winsup/cygwin/mm/mmap.cc
@@ -651,7 +651,7 @@ mmap_list::try_map (void *addr, size_t len, int new_prot, int flags, off_t off)
 	  break;
       if (rec)
 	{
-	  if (u_addr > (caddr_t) addr || u_addr + len < (caddr_t) addr + len
+	  if (u_addr > (caddr_t) addr || u_addr + u_len < (caddr_t) addr + len
 	      || !rec->compatible_flags (flags))
 	    {
 	      /* Partial match only, or access mode doesn't match. */