dtrace: initialize the insn length in the right branch of the die notifier

Absent this fix, dtrace will crash on any platform *except* for a buggy Xen.

Signed-off-by: Nick Alcock <nick.alcock@oracle.com>

diff --git a/kernel/dtrace/dtrace_os.c b/kernel/dtrace/dtrace_os.c
index b20e9bc8c3aaa48c11ee712c0109f422366349cf..cc0d8e20a993d886b4e79de1a33aa6fbb97e0de7 100644 (file)
--- a/kernel/dtrace/dtrace_os.c
+++ b/kernel/dtrace/dtrace_os.c
@@ -307,6 +307,9 @@ static int dtrace_die_notifier(struct notifier_block *nb, unsigned long val,
                }
 
                if (rval != 0) {
+                       kernel_insn_init(&insn, (void *)dargs->regs->ip);
+                       insn_get_length(&insn);
+
                        dargs->regs->ip += insn.length;
 
                        return NOTIFY_OK | NOTIFY_STOP_MASK;