Fix a seg-fault in the ELF note parser when a note with an excessively large alignment is encountered.

	PR 22788
	* elf.c (elf_parse_notes): Reject notes with excessuively large
	alignments.

2 files changed, 8 insertions, 0 deletions

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 6dd9f47..7462f91 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,3 +1,9 @@
+2018-02-08  Nick Clifton  <nickc@redhat.com>
+
+	PR 22788
+	* elf.c (elf_parse_notes): Reject notes with excessuively large
+	alignments.
+
 2018-02-07  Alan Modra  <amodra@gmail.com>
 
 	Revert 2018-01-17  Alan Modra  <amodra@gmail.com>
diff --git a/bfd/elf.c b/bfd/elf.c
index dedf35f..db1e076 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -11012,6 +11012,8 @@ elf_parse_notes (bfd *abfd, char *buf, size_t size, file_ptr offset,
      align is less than 4, we use 4 byte alignment.   */
   if (align < 4)
     align = 4;
+  if (align != 4 && align != 8)
+    return FALSE;
 
   p = buf;
   while (p < buf + size)