Fix null derefs in x86 dissasembler code.
BUG=428
TEST=N/A
Review URL: http://breakpad.appspot.com/285001
git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@789 4c0a9323-5329-0410-9bdc-e9ce6186880e
diff --git a/src/processor/disassembler_x86.cc b/src/processor/disassembler_x86.cc
index 76015f4..7e41e4b 100644
--- a/src/processor/disassembler_x86.cc
+++ b/src/processor/disassembler_x86.cc
@@ -174,7 +174,7 @@
switch (current_instr_.type) {
case libdis::insn_xor:
if (src && src->type == libdis::op_register &&
- dest->type == libdis::op_register &&
+ dest && dest->type == libdis::op_register &&
src->data.reg.id == bad_register_.id &&
src->data.reg.id == dest->data.reg.id)
register_valid_ = false;
@@ -192,7 +192,7 @@
case libdis::insn_xchg:
case libdis::insn_xchgcc:
if (dest && dest->type == libdis::op_register &&
- src->type == libdis::op_register) {
+ src && src->type == libdis::op_register) {
if (dest->data.reg.id == bad_register_.id)
memcpy(&bad_register_, &src->data.reg, sizeof(libdis::x86_reg_t));
else if (src->data.reg.id == bad_register_.id)