[binutils-gdb/binutils-2_29-branch] Check for an invalid note size when parsing ELF notes.

[Nick Clifton]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=30326b094b8fc2594c76cf4beab70965afa7a111

commit 30326b094b8fc2594c76cf4beab70965afa7a111
Author: Nick Clifton <nickc@redhat.com>
Date:   Fri Sep 1 10:17:00 2017 +0100

    Check for an invalid note size when parsing ELF notes.
    
    	PR 21933
    	PR 22060
    	* elf.c (elf_read_notes): Check for a note size of -1.

Diff:
---
 bfd/ChangeLog | 6 ++++++
 bfd/elf.c     | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index e9ea6cf..8db7080 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,5 +1,11 @@
 2017-09-01  Nick Clifton  <nickc@redhat.com>
 
+	PR 21933
+	PR 22060
+	* elf.c (elf_read_notes): Check for a note size of -1.
+
+2017-09-01  Nick Clifton  <nickc@redhat.com>
+
 	PR 22058
 	* elf-attrs.c (_bfd_elf_parse_attributes): Ensure that the
 	attribute buffer is NUL terminated.
diff --git a/bfd/elf.c b/bfd/elf.c
index 063a6e4..fbf639b 100644
--- a/bfd/elf.c
+++ b/bfd/elf.c
@@ -10976,7 +10976,7 @@ elf_read_notes (bfd *abfd, file_ptr offset, bfd_size_type size)
 {
   char *buf;
 
-  if (size <= 0)
+  if (size == 0 || (size + 1) == 0)
     return TRUE;
 
   if (bfd_seek (abfd, offset, SEEK_SET) != 0)