[binutils-gdb] decompress_contents: fuss over 32-bit long

[Alan Modra]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=738767bc853adeb1f9f75e1bf2618b5e739b2d21

commit 738767bc853adeb1f9f75e1bf2618b5e739b2d21
Author: Alan Modra <amodra@gmail.com>
Date:   Sun Jun 1 13:07:58 2025 +0930

    decompress_contents: fuss over 32-bit long
    
    Some 64-bit compilers have a 32-bit long, which could result in an
    endless loop if uncompressed_size is larger than 4G.

Diff:
---
 bfd/compress.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/bfd/compress.c b/bfd/compress.c
index b693204a3ea..4f92455dbd6 100644
--- a/bfd/compress.c
+++ b/bfd/compress.c
@@ -521,8 +521,10 @@ decompress_contents (bool is_zstd, bfd_byte *compressed_buffer,
      buffers concatenated together, so we uncompress in a loop.  */
   do
     {
-      uLongf dst_len = uncompressed_size;
-      uLong src_len = compressed_size;
+      uLongf dst_len = (uncompressed_size > ULONG_MAX ? ULONG_MAX
+			: uncompressed_size);
+      uLong src_len = (compressed_size > ULONG_MAX ? ULONG_MAX
+		       : compressed_size);
       int rc = uncompress2 ((Bytef *) uncompressed_buffer, &dst_len,
 			    (Bytef *) compressed_buffer, &src_len);
       if (rc != Z_OK)