[PATCH 1/8] telemetry: fix thread-unsafe command parsing

[Stephen Hemminger <stephen@networkplumber.org>]

The telemetry client_handler() runs in a detached thread per connection,
and up to MAX_CONNECTIONS instances can run concurrently.
The function strtok() keeps parser state in a static variable
shared across all threads, so concurrent clients corrupt each other's
command parsing. Use strtok_r() with a local saveptr.

Fixes: 6dd571fd07c3 ("telemetry: introduce new functionality")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 lib/telemetry/telemetry.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/telemetry/telemetry.c b/lib/telemetry/telemetry.c
index b109d076d4..e591c1e283 100644
--- a/lib/telemetry/telemetry.c
+++ b/lib/telemetry/telemetry.c
@@ -415,8 +415,9 @@ client_handler(void *sock_id)
 	int bytes = read(s, buffer, sizeof(buffer) - 1);
 	while (bytes > 0) {
 		buffer[bytes] = 0;
-		const char *cmd = strtok(buffer, ",");
-		const char *param = strtok(NULL, "\0");
+		char *saveptr = NULL;
+		const char *cmd = strtok_r(buffer, ",", &saveptr);
+		const char *param = strtok_r(NULL, "\0", &saveptr);
 		struct cmd_callback cb = {.fn = unknown_command};
 		int i;
 
-- 
2.53.0