Fix: event: unchecked return value for lttng_strncpy

Reported by Coverity:

  CID 1475806: Unchecked return value (CHECKED_RETURN)
  Calling lttng_strncpy without checking return value.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ib2b16bef61bcc24fea381c18fd8f914e9a84a6e7

diff --git a/src/common/event.cpp b/src/common/event.cpp
index 6dca04def6e082527338da51694af1605546787a..8e1b99ff902fb5dd91989840ade2ffc483afc170 100644 (file)
--- a/src/common/event.cpp
+++ b/src/common/event.cpp
@@ -997,7 +997,8 @@ static ssize_t lttng_event_context_perf_counter_populate_from_payload(
                const struct lttng_payload_view *view,
                struct lttng_event_context *event_ctx)
 {
-       ssize_t ret, offset = 0;
+       int ret;
+       ssize_t consumed, offset = 0;
        const struct lttng_event_context_perf_counter_comm *comm;
        size_t name_len;
        const struct lttng_buffer_view comm_view = lttng_buffer_view_from_view(
@@ -1009,7 +1010,7 @@ static ssize_t lttng_event_context_perf_counter_populate_from_payload(
                        event_ctx->ctx == LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER);
 
        if (!lttng_buffer_view_is_valid(&comm_view)) {
-               ret = -1;
+               consumed = -1;
                goto end;
        }
 
@@ -1026,7 +1027,7 @@ static ssize_t lttng_event_context_perf_counter_populate_from_payload(
                                                name_len);
 
                if (!lttng_buffer_view_is_valid(&provider_name_view)) {
-                       ret = -1;
+                       consumed = -1;
                        goto end;
                }
 
@@ -1034,21 +1035,25 @@ static ssize_t lttng_event_context_perf_counter_populate_from_payload(
 
                if (!lttng_buffer_view_contains_string(
                                    &provider_name_view, name, name_len)) {
-                       ret = -1;
+                       consumed = -1;
                        goto end;
                }
 
-               lttng_strncpy(event_ctx->u.perf_counter.name, name, name_len);
+               ret = lttng_strncpy(event_ctx->u.perf_counter.name, name, name_len);
+               if (ret) {
+                       consumed = -1;
+                       goto end;
+               }
                offset += name_len;
        }
 
        event_ctx->u.perf_counter.config = comm->config;
        event_ctx->u.perf_counter.type = comm->type;
 
-       ret = offset;
+       consumed = offset;
 
 end:
-       return ret;
+       return consumed;
 }
 
 ssize_t lttng_event_context_create_from_payload(