[binutils-gdb] bfd: fix potential missing seek

[Alan Modra]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2fbe667884bc37e710f12937ded1b355be42fa56

commit 2fbe667884bc37e710f12937ded1b355be42fa56
Author: Roman Kapl <code@rkapl.cz>
Date:   Sat Nov 29 12:45:27 2025 +0100

    bfd: fix potential missing seek
    
    If a file was closed by cache and then bfd_open_file was called followed
    by e.g. bfd_seek to the original position, the seek would be optimized out
    while the real file position was still zero (as fopened).  I added
    `bfd_io_force` to force the seek at next IO occasion.
    
    This could lead e.g. to appearence of a corrupted object in ld:
      symbol number 0 uses unsupported binding of 6
      or invalid string offset #X >= #Y for section
    
    Signed-off-by: Roman Kapl <code@rkapl.cz>

Diff:
---
 bfd/cache.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/bfd/cache.c b/bfd/cache.c
index 3bf9c9449a4..3342e2d5008 100644
--- a/bfd/cache.c
+++ b/bfd/cache.c
@@ -177,6 +177,7 @@ bfd_cache_delete (bfd *abfd)
   BFD_ASSERT (open_files > 0);
   --open_files;
   abfd->flags |= BFD_CLOSED_BY_CACHE;
+  abfd->last_io = bfd_io_force;
 
   return ret;
 }