[DTrace-devel] [PATCH] stapsdt: fix out-of-bounds access when provider name is not specified

[Kris Van Hees]

Signed-off-by: Kris Van Hees <kris.van.hees at oracle.com>
---
 libdtrace/dt_pid.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libdtrace/dt_pid.c b/libdtrace/dt_pid.c
index 4af9141aa..ffc52132f 100644
--- a/libdtrace/dt_pid.c
+++ b/libdtrace/dt_pid.c
@@ -1518,10 +1518,14 @@ dt_pid_create_stapsdt_probes(dtrace_probedesc_t *pdp, dtrace_hdl_t *dtp, dt_pcb_
 	dt_proc_t *dpr = NULL;
 	const char *pidstr;
 	pid_t pid;
+	size_t len = strlen(pdp->prv);
+
+	if (len == 0)
+		return 0;
 
 	assert(pcb != NULL);
 
-	pidstr = &pdp->prv[strlen(pdp->prv)];
+	pidstr = &pdp->prv[len];
 
 	while (isdigit(*(pidstr - 1)))
 		pidstr--;
-- 
2.45.2