1 files changed, 85 insertions, 0 deletions
diff --git a/debian/patches/pr21432.diff b/debian/patches/pr21432.diff
new file mode 100644
index 0000000..fe4fe60
--- /dev/null
+++ b/debian/patches/pr21432.diff
@@ -0,0 +1,85 @@
+From a941291cab71b9ac356e1c03968c177c03e602ab Mon Sep 17 00:00:00 2001
+From: Alan Modra <amodra@gmail.com>
+Date: Sat, 29 Apr 2017 14:48:16 +0930
+Subject: [PATCH] PR21432, buffer overflow in perform_relocation
+
+The existing reloc offset range tests didn't catch small negative
+offsets less than the size of the reloc field.
+
+	PR 21432
+	* reloc.c (reloc_offset_in_range): New function.
+	(bfd_perform_relocation, bfd_install_relocation): Use it.
+	(_bfd_final_link_relocate): Likewise.
+---
+ bfd/ChangeLog |  7 +++++++
+ bfd/reloc.c   | 32 ++++++++++++++++++++------------
+ 2 files changed, 27 insertions(+), 12 deletions(-)
+
+diff --git a/bfd/reloc.c b/bfd/reloc.c
+index 9a04022..12520d1 100644
+--- a/bfd/reloc.c
++++ b/bfd/reloc.c
+@@ -538,6 +538,22 @@ bfd_check_overflow (enum complain_overflow how,
+   return flag;
+ }
+ 
++/* HOWTO describes a relocation, at offset OCTET.  Return whether the
++   relocation field is within SECTION of ABFD.  */
++
++static bfd_boolean
++reloc_offset_in_range (reloc_howto_type *howto, bfd *abfd,
++		       asection *section, bfd_size_type octet)
++{
++  bfd_size_type octet_end = bfd_get_section_limit_octets (abfd, section);
++  bfd_size_type reloc_size = bfd_get_reloc_size (howto);
++
++  /* The reloc field must be contained entirely within the section.
++     Allow zero length fields (marker relocs or NONE relocs where no
++     relocation will be performed) at the end of the section.  */
++  return octet <= octet_end && octet + reloc_size <= octet_end;
++}
++
+ /*
+ FUNCTION
+ 	bfd_perform_relocation
+@@ -619,15 +635,9 @@ bfd_perform_relocation (bfd *abfd,
+   if (howto == NULL)
+     return bfd_reloc_undefined;
+ 
+-  /* Is the address of the relocation really within the section?
+-     Include the size of the reloc in the test for out of range addresses.
+-     PR 17512: file: c146ab8b, 46dff27f, 38e53ebf.  */
++  /* Is the address of the relocation really within the section?  */
+   octets = reloc_entry->address * bfd_octets_per_byte (abfd);
+-  if (octets + bfd_get_reloc_size (howto)
+-      > bfd_get_section_limit_octets (abfd, input_section)
+-      /* Check for an overly large offset which
+-	 masquerades as a negative value too.  */
+-      || (octets + bfd_get_reloc_size (howto) < bfd_get_reloc_size (howto)))
++  if (!reloc_offset_in_range (howto, abfd, input_section, octets))
+     return bfd_reloc_outofrange;
+ 
+   /* Work out which section the relocation is targeted at and the
+@@ -1015,8 +1025,7 @@ bfd_install_relocation (bfd *abfd,
+ 
+   /* Is the address of the relocation really within the section?  */
+   octets = reloc_entry->address * bfd_octets_per_byte (abfd);
+-  if (octets + bfd_get_reloc_size (howto)
+-      > bfd_get_section_limit_octets (abfd, input_section))
++  if (!reloc_offset_in_range (howto, abfd, input_section, octets))
+     return bfd_reloc_outofrange;
+ 
+   /* Work out which section the relocation is targeted at and the
+@@ -1354,8 +1363,7 @@ _bfd_final_link_relocate (reloc_howto_type *howto,
+   bfd_size_type octets = address * bfd_octets_per_byte (input_bfd);
+ 
+   /* Sanity check the address.  */
+-  if (octets + bfd_get_reloc_size (howto)
+-      > bfd_get_section_limit_octets (input_bfd, input_section))
++  if (!reloc_offset_in_range (howto, input_bfd, input_section, octets))
+     return bfd_reloc_outofrange;
+ 
+   /* This function assumes that we are dealing with a basic relocation
+-- 
+2.9.3
+