From: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Date: Thu, 10 Sep 2020 16:23:28 +0000 (-0400)
Subject: userspace-probe: replace explicit null-termination check
X-Git-Url: http://git.efficios.com/?p=lttng-tools.git;a=commitdiff_plain;h=b9e63e21bd01c0deeaec2195ba912e38460bc038

userspace-probe: replace explicit null-termination check

Replace explicit null-termination checks by uses of
lttng_buffer_view_contains_string() which provides the same
guarantees and ensures the string pointer is within the view.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: If0038a82ad7dfe1ed0e8cdef7870d5e25d62200d
---

diff --git a/src/common/userspace-probe.c b/src/common/userspace-probe.c
index 9e5429f73..49cc83575 100644
--- a/src/common/userspace-probe.c
+++ b/src/common/userspace-probe.c
@@ -1212,11 +1212,14 @@ int lttng_userspace_probe_location_function_create_from_payload(
 	binary_path_src = function_name_src +
 			location_function_comm->function_name_len;
 
-	if (function_name_src[location_function_comm->function_name_len - 1] != '\0') {
+	if (lttng_buffer_view_contains_string(&view->buffer, function_name_src,
+			    location_function_comm->function_name_len)) {
 		ret = -LTTNG_ERR_INVALID;
 		goto end;
 	}
-	if (binary_path_src[location_function_comm->binary_path_len - 1] != '\0') {
+
+	if (lttng_buffer_view_contains_string(&view->buffer, binary_path_src,
+			    location_function_comm->binary_path_len)) {
 		ret = -LTTNG_ERR_INVALID;
 		goto end;
 	}
@@ -1300,17 +1303,20 @@ int lttng_userspace_probe_location_tracepoint_create_from_payload(
 	binary_path_src = provider_name_src +
 			location_tracepoint_comm->provider_name_len;
 
-	if (probe_name_src[location_tracepoint_comm->probe_name_len - 1] != '\0') {
+	if (lttng_buffer_view_contains_string(&view->buffer, probe_name_src,
+			    location_tracepoint_comm->probe_name_len)) {
 		ret = -LTTNG_ERR_INVALID;
 		goto end;
 	}
 
-	if (provider_name_src[location_tracepoint_comm->provider_name_len - 1] != '\0') {
+	if (lttng_buffer_view_contains_string(&view->buffer, provider_name_src,
+			    location_tracepoint_comm->provider_name_len)) {
 		ret = -LTTNG_ERR_INVALID;
 		goto end;
 	}
 
-	if (binary_path_src[location_tracepoint_comm->binary_path_len - 1] != '\0') {
+	if (lttng_buffer_view_contains_string(&view->buffer, binary_path_src,
+			    location_tracepoint_comm->binary_path_len)) {
 		ret = -LTTNG_ERR_INVALID;
 		goto end;
 	}