[PATCH v2] bfd: Handle bmmap failure in _bfd_mmap_read_temporary

[H.J. Lu]

iovec->bmmap may return MAP_FAILED, which happens in GDB on objects with
iovec == opncls_iovec.  Update _bfd_mmap_read_temporary to handle
iovec->bmmap failure.

	* libbfd.c (_bfd_mmap_read_temporary): Handle iovec->bmmap
	failure.
---
 bfd/libbfd.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/bfd/libbfd.c b/bfd/libbfd.c
index 869f0ed5c66..5126ee207a8 100644
--- a/bfd/libbfd.c
+++ b/bfd/libbfd.c
@@ -1205,12 +1205,18 @@ _bfd_mmap_read_temporary (void **data_p, size_t *size_p,
 		 && (abfd->flags & BFD_PLUGIN) == 0);
   if (use_mmmap)
     {
-      data = _bfd_mmap_readonly_temporary (abfd, size, mmap_base,
-					   size_p);
-      if (data == NULL || data == MAP_FAILED)
-	abort ();
-      *data_p = data;
-      return true;
+      void *mmaped = _bfd_mmap_readonly_temporary (abfd, size,
+						   mmap_base,
+						   size_p);
+      /* MAP_FAILED is returned when called from GDB on an object with
+	 opncls_iovec.  Use bfd_read in this case.  */
+      if (mmaped != MAP_FAILED)
+	{
+	  if (mmaped == NULL)
+	    abort ();
+	  *data_p = mmaped;
+	  return true;
+	}
     }
 #endif
 
-- 
2.44.0