[binutils-gdb] Fix an illegal memory access when disassebling a corrupt ARM file.

[Nick Clifton <nickc@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=771860451862e89df453cd3b635a00d47d602533

commit 771860451862e89df453cd3b635a00d47d602533
Author: Nick Clifton <nickc@redhat.com>
Date:   Wed Mar 15 11:44:56 2023 +0000

    Fix an illegal memory access when disassebling a corrupt ARM file.
    
      PR 30230
      * arm-dis.c (get_sym_code_type): Check for non-ELF symbols.

Diff:
---
 opcodes/ChangeLog |  5 +++++
 opcodes/arm-dis.c | 17 ++++++++++++-----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 9cf68d744b9..fb6612abfa6 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,8 @@
+2023-03-15  Nick Clifton  <nickc@redhat.com>
+
+	PR 30230
+	* arm-dis.c (get_sym_code_type): Check for non-ELF symbols.
+
 2023-02-28  Richard Ball  <richard.ball@arm.com>
 
 	* aarch64-opc.c: Add MEC system registers.
diff --git a/opcodes/arm-dis.c b/opcodes/arm-dis.c
index 65155ee173e..dffbad3e525 100644
--- a/opcodes/arm-dis.c
+++ b/opcodes/arm-dis.c
@@ -12400,13 +12400,14 @@ find_ifthen_state (bfd_vma pc,
    mapping symbol.  */
 
 static int
-is_mapping_symbol (struct disassemble_info *info, int n,
+is_mapping_symbol (struct disassemble_info *info,
+		   int n,
 		   enum map_type *map_type)
 {
-  const char *name;
+  const char *name = bfd_asymbol_name (info->symtab[n]);
 
-  name = bfd_asymbol_name (info->symtab[n]);
-  if (name[0] == '$' && (name[1] == 'a' || name[1] == 't' || name[1] == 'd')
+  if (name[0] == '$'
+      && (name[1] == 'a' || name[1] == 't' || name[1] == 'd')
       && (name[2] == 0 || name[2] == '.'))
     {
       *map_type = ((name[1] == 'a') ? MAP_ARM
@@ -12443,12 +12444,18 @@ get_sym_code_type (struct disassemble_info *info,
 {
   elf_symbol_type *es;
   unsigned int type;
+  asymbol * sym;
 
   /* If the symbol is in a different section, ignore it.  */
   if (info->section != NULL && info->section != info->symtab[n]->section)
     return false;
 
-  es = *(elf_symbol_type **)(info->symtab + n);
+  /* PR 30230: Reject non-ELF symbols, eg synthetic ones.  */
+  sym = info->symtab[n];
+  if (bfd_asymbol_flavour (sym) != bfd_target_elf_flavour)
+    return false;
+
+  es = (elf_symbol_type *) sym;
   type = ELF_ST_TYPE (es->internal_elf_sym.st_info);
 
   /* If the symbol has function type then use that.  */