[lttng-dev] [PATCH lttng-tools 13/24] Fix: illegal memory access in write_pidfile

[Mathieu Desnoyers]

Found by Coverity:
CID 1243023 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)3. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array pidfile_path of
size 4096 bytes might leave the destination string unterminated.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>
---
 src/bin/lttng-sessiond/main.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/bin/lttng-sessiond/main.c b/src/bin/lttng-sessiond/main.c
index d94dbd7..6081fb2 100644
--- a/src/bin/lttng-sessiond/main.c
+++ b/src/bin/lttng-sessiond/main.c
@@ -5443,7 +5443,10 @@ static int write_pidfile(void)
 	assert(rundir);
 
 	if (opt_pidfile) {
-		strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path));
+		if (lttng_strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path))) {
+			ret = -1;
+			goto error;
+		}
 	} else {
 		/* Build pidfile path from rundir and opt_pidfile. */
 		ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/"
-- 
2.1.4