X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=probes%2Flttng-probe-user.c;h=099a66b229a46fcc90f7b5fd7e504a3806d7d0e6;hb=8e3b6653bf5bc3f64a6bc50d2fdce57ea5bbd4e8;hp=e92107d94cfbd1948eb3773deb6c55a228f48505;hpb=156a3977f8fa114924d7bbd2bd04c94fd2ac0649;p=lttng-modules.git

diff --git a/probes/lttng-probe-user.c b/probes/lttng-probe-user.c
index e92107d9..099a66b2 100644
--- a/probes/lttng-probe-user.c
+++ b/probes/lttng-probe-user.c
@@ -31,8 +31,12 @@
 long lttng_strlen_user_inatomic(const char *addr)
 {
 	long count = 0;
-	mm_segment_t old_fs = get_fs();
+	mm_segment_t old_fs;
 
+	if (!addr)
+		return 0;
+
+	old_fs = get_fs();
 	set_fs(KERNEL_DS);
 	pagefault_disable();
 	for (;;) {