Fix: userspace-probe: unreported error on string copy error

Issue
=====

String copy errors, either due to the length or an allocation failure,
are not reported by
lttng_userspace_probe_location_tracepoint_create_from_payload
and don't log a clear error message.

This allowed truncation bugs like the one fixed in b45a296 to go
unnoticed.

Fix
===

Return an "invalid" status code and log a more descriptive error
message.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ia07cac7cba315ea79337262e9082dd06eb60950f

diff --git a/src/common/userspace-probe.c b/src/common/userspace-probe.c
index 50795c59c0e57e5523a5e02b13ac2f7bf70e0423..60bdddb4827211f02292fb975a2d4324d1dcba8b 100644 (file)
--- a/src/common/userspace-probe.c
+++ b/src/common/userspace-probe.c
@@ -1381,18 +1381,21 @@ int lttng_userspace_probe_location_tracepoint_create_from_payload(
 
        probe_name = lttng_strndup(probe_name_src, LTTNG_SYMBOL_NAME_LEN);
        if (!probe_name) {
-               PERROR("lttng_strndup");
+               PERROR("Failed to allocate probe name");
+               ret = -LTTNG_ERR_INVALID;
                goto end;
        }
        provider_name = lttng_strndup(provider_name_src, LTTNG_SYMBOL_NAME_LEN);
        if (!provider_name) {
-               PERROR("lttng_strndup");
+               PERROR("Failed to allocate provider name");
+               ret = -LTTNG_ERR_INVALID;
                goto end;
        }
 
        binary_path = lttng_strndup(binary_path_src, LTTNG_PATH_MAX);
        if (!binary_path) {
-               PERROR("lttng_strndup");
+               PERROR("Failed to allocate binary path");
+               ret = -LTTNG_ERR_INVALID;
                goto end;
        }