[PATCH 6/6] cmdline: add null checks for invalid input

[Bruce Richardson <bruce.richardson@intel.com>]

To harden the public API, add some NULL checks before dereferencing
pointers. Properly written apps should never call these with NULL, but
to increase resilience, we'll add the checks.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/cmdline/cmdline.c        | 3 +++
 lib/cmdline/cmdline_rdline.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/lib/cmdline/cmdline.c b/lib/cmdline/cmdline.c
index d1003f0b8e..51fbc36cef 100644
--- a/lib/cmdline/cmdline.c
+++ b/lib/cmdline/cmdline.c
@@ -103,6 +103,9 @@ RTE_EXPORT_SYMBOL(cmdline_get_rdline)
 struct rdline*
 cmdline_get_rdline(struct cmdline *cl)
 {
+	if (!cl)
+		return NULL;
+
 	return &cl->rdl;
 }
 
diff --git a/lib/cmdline/cmdline_rdline.c b/lib/cmdline/cmdline_rdline.c
index 0a5a399b32..15da285c8d 100644
--- a/lib/cmdline/cmdline_rdline.c
+++ b/lib/cmdline/cmdline_rdline.c
@@ -618,6 +618,9 @@ RTE_EXPORT_SYMBOL(rdline_get_history_buffer_size)
 size_t
 rdline_get_history_buffer_size(struct rdline *rdl)
 {
+	if (!rdl)
+		return 0;
+
 	return sizeof(rdl->history_buf);
 }
 
-- 
2.51.0