[PATCH v2] bfd: alpha: Fix crash caused by double free with --no-keep-memory

[James Clarke]

Without this, ld has been seen to crash in libc when freeing tsec_free:

*** Error in `/usr/bin/ld': double free or corruption (!prev): 0x0000000120ceb6a0 ***

_bfd_elf_link_read_relocs will always return the cached value if
present, even if keep_memory is false, therefore setting tsec_free to
NULL only when keep_memory is true is not sufficient.

bfd/
	* elf64-alpha.c (elf64_alpha_relax_opt_call): Don't free
	tsec_free if it is cached inside tsec's section data.
---
 bfd/elf64-alpha.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/bfd/elf64-alpha.c b/bfd/elf64-alpha.c
index 44f2cfe004..4c31a07ad0 100644
--- a/bfd/elf64-alpha.c
+++ b/bfd/elf64-alpha.c
@@ -3215,7 +3215,9 @@ elf64_alpha_relax_opt_call (struct alpha_relax_info *info, bfd_vma symval)
 	  if (tsec_relocs == NULL)
 	    return 0;
 	  tsec_relend = tsec_relocs + info->tsec->reloc_count;
-	  tsec_free = (info->link_info->keep_memory ? NULL : tsec_relocs);
+	  tsec_free = (elf_section_data (info->tsec)->relocs == tsec_relocs
+		       ? NULL
+		       : tsec_relocs);
 	}
 
       /* Recover the symbol's offset within the section.  */
-- 
2.11.0