818* dtrace.c: dtrace_probe: When checking for Xen probes with

dtrace4linux · dtrace4linux · commit 4ba27f30a36d · 2013-03-06T23:25:23.000Z
interrupts disabled, be careful of deref of null ptr.
diff --git a/.release b/.release
@@ -1,3 +1,3 @@
-date=Wed Mar  6 22:49:59 GMT 2013
-release=dtrace-20130306
-build=449
+date=Wed Mar  6 23:25:18 GMT 2013
+release=dtrace-20130306a
+build=450
diff --git a/archive.sh b/archive.sh
@@ -1,6 +1,6 @@
 NAME=dtrace
 MAJ_VERSION=1
-MIN_VERSION=0145
+MIN_VERSION=0146
 EXCLUDE="*.ko *.o .git"
 EXCLUDE_DIRS="build-"
-#date Sun Aug 19 17:57:46 BST 2012
+#date Wed Mar  6 22:51:14 GMT 2013
diff --git a/driver/Makefile b/driver/Makefile
@@ -63,7 +63,7 @@ ifdef BUILD_i386
 	dtracedrv-objs += ../libgcc.a
 endif
 ifdef BUILD_ARM
-	dtracedrv-objs += divmod64.o ../libgcc.a
+	dtracedrv-objs += arm_divmod64.o 
 endif
 
 obj-m := dtracedrv.o
diff --git a/driver/dtrace.c b/driver/dtrace.c
@@ -6262,6 +6262,7 @@ dtrace_probe(dtrace_id_t id, uintptr_t arg0, uintptr_t arg1,
 	void __dtrace_probe(dtrace_id_t id, uintptr_t arg0, uintptr_t arg1,
 		    uintptr_t arg2, uintptr_t arg3, uintptr_t arg4);
 	int cpu;
+	cpu_core_t *cpup;
 
 	/***********************************************/
 	/*   Allow us to disable dtrace as soon as we  */
@@ -6283,7 +6284,13 @@ dtrace_probe(dtrace_id_t id, uintptr_t arg0, uintptr_t arg1,
 	/*   dtrace_int[13]_handler.		       */
 	/***********************************************/
 	cpu = cpu_get_id();
-	if (cpu_get_this()->cpuc_regs->r_rfl & X86_EFLAGS_IF) {
+
+	/***********************************************/
+	/*   cpuc_regs  may  be null until we get the  */
+	/*   first probe. Silly me.		       */
+	/***********************************************/
+	cpup = cpu_get_this();
+	if (cpup && cpup->cpuc_regs && cpup->cpuc_regs->r_rfl & X86_EFLAGS_IF) {
 		if (dtrace_safe) {
 			cnt_probe_safe++;
 			return;
