[binutils-gdb] [opcodes/arm] Fix potential null pointer dereferences

[Luis Machado]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=76a95facf1260326469dc9952adc6ee034bac735

commit 76a95facf1260326469dc9952adc6ee034bac735
Author: Luis Machado <luis.machado@arm.com>
Date:   Wed Nov 2 07:17:46 2022 +0000

    [opcodes/arm] Fix potential null pointer dereferences
    
      PR tdep/29598
    
      As pointed out in the bug ticket, we have a couple potential null pointer
      dereferencing situations. Harden those.
    
      Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29598

Diff:
---
 opcodes/arm-dis.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/opcodes/arm-dis.c b/opcodes/arm-dis.c
index 47a0a38adec..8f29537a2ba 100644
--- a/opcodes/arm-dis.c
+++ b/opcodes/arm-dis.c
@@ -12484,6 +12484,10 @@ mapping_symbol_for_insn (bfd_vma pc, struct disassemble_info *info,
   bool found = false;
   bool can_use_search_opt_p = false;
 
+  /* Sanity check.  */
+  if (info == NULL)
+    return false;
+
   /* Default to DATA.  A text section is required by the ABI to contain an
      INSN mapping symbol at the start.  A data section has no such
      requirement, hence if no mapping symbol is found the section must
@@ -12497,7 +12501,7 @@ mapping_symbol_for_insn (bfd_vma pc, struct disassemble_info *info,
     type = MAP_ARM;
   struct arm_private_data *private_data;
 
-  if (info->private_data == NULL
+  if (info->private_data == NULL || info->symtab == NULL
       || info->symtab_size == 0
       || bfd_asymbol_flavour (*info->symtab) != bfd_target_elf_flavour)
     return false;