[binutils-gdb] x86: Guard against corrupted PLT

[H.J.Lu]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=61e3bf5f83f7e505b6bc51ef65426e5b31e6e360

commit 61e3bf5f83f7e505b6bc51ef65426e5b31e6e360
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Fri Sep 22 14:15:40 2017 -0700

    x86: Guard against corrupted PLT
    
    There should be only one entry in PLT for a given symbol.  Set howto to
    NULL after processing a PLT entry to guard against corrupted PLT so that
    the duplicated PLT entries are skipped.
    
    	PR binutils/22170
    	* elfxx-x86.c (_bfd_x86_elf_get_synthetic_symtab): Guard against
    	corrupted PLT.

Diff:
---
 bfd/ChangeLog   | 6 ++++++
 bfd/elfxx-x86.c | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/bfd/ChangeLog b/bfd/ChangeLog
index 1c24079..9b4cb08 100644
--- a/bfd/ChangeLog
+++ b/bfd/ChangeLog
@@ -1,5 +1,11 @@
 2017-09-22  H.J. Lu  <hongjiu.lu@intel.com>
 
+	PR binutils/22170
+	* elfxx-x86.c (_bfd_x86_elf_get_synthetic_symtab): Guard against
+	corrupted PLT.
+
+2017-09-22  H.J. Lu  <hongjiu.lu@intel.com>
+
 	PR binutils/22163
 	* elfxx-x86.c (_bfd_x86_elf_get_synthetic_symtab): Also return
 	-1 if bfd_canonicalize_dynamic_reloc returns 0.
diff --git a/bfd/elfxx-x86.c b/bfd/elfxx-x86.c
index 11883de..dcc393b 100644
--- a/bfd/elfxx-x86.c
+++ b/bfd/elfxx-x86.c
@@ -1962,6 +1962,10 @@ _bfd_x86_elf_get_synthetic_symtab (bfd *abfd,
 		names += sizeof ("@plt");
 		n++;
 		s++;
+		/* There should be only one entry in PLT for a given
+		   symbol.  Set howto to NULL after processing a PLT
+		   entry to guard against corrupted PLT.  */
+		p->howto = NULL;
 	      }
 	    offset += plt_entry_size;
 	  }