[PATCH] [opcodes/arm] Fix potential null pointer dereferences

[Luis Machado <luis.machado@arm.com>]

  PR 29598: dereferenced null pointer in arm-dis.c

  As pointed out in the bug ticket, we have a couple potential null pointer
  dereferencing situations for mapping_symbol_for_insn. Harden those.
---
 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 31ed81f5a4e..01b43582513 100644
--- a/opcodes/arm-dis.c
+++ b/opcodes/arm-dis.c
@@ -12482,6 +12482,10 @@ 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
@@ -12495,7 +12499,7 @@ 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;
-- 
2.25.1