[binutils-gdb] alpha-ecoff: check archive element size

[Alan Modra]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c7b19c486012e1dd2a10434f1891c86b1398419a

commit c7b19c486012e1dd2a10434f1891c86b1398419a
Author: Alan Modra <amodra@gmail.com>
Date:   Mon Oct 6 20:56:56 2025 +1030

    alpha-ecoff: check archive element size
    
    If we run out of file before decompression finishes, the archive is
    broken.  Don't allow the buffer to be returned with uninitialised data.
    
            * coff-alpha.c (alpha_ecoff_get_elt_at_filepos): Return an
            error if the full element size can't be decompressed.

Diff:
---
 bfd/coff-alpha.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/bfd/coff-alpha.c b/bfd/coff-alpha.c
index fcc8aef6673..9a621e93c5b 100644
--- a/bfd/coff-alpha.c
+++ b/bfd/coff-alpha.c
@@ -2204,6 +2204,8 @@ alpha_ecoff_get_elt_at_filepos (bfd *archive, file_ptr filepos,
 	  if (left == 0)
 	    break;
 	}
+      if (left != 0)
+	goto error_return;
     }
 
   /* Now the uncompressed file contents are in buf.  */