[PATCH] tools: Fix potential null-deref with result of strtok_r

[Maks Mishin]

Return value of a function 'strtok_r' is dereferenced at kwbimage.c:1655 
without checking for NULL, but it is usually checked for this function.

Signed-off-by: Maks Mishin <maks.mishi...@gmail.com>
---
 tools/kwbimage.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/kwbimage.c b/tools/kwbimage.c
index d1cbced28f..3dcf5ba66b 100644
--- a/tools/kwbimage.c
+++ b/tools/kwbimage.c
@@ -1653,6 +1653,12 @@ static int image_create_config_parse_oneline(char *line,
        char *unknown_msg = "Ignoring unknown line '%s'\n";
 
        keyword = strtok_r(line, delimiters, &saveptr);
+
+       if (!keyword) {
+               fprintf(stderr, "Parameter missing in line '%s'\n", line);
+               return -1;
+       }
+
        keyword_id = recognize_keyword(keyword);
 
        if (!keyword_id) {
-- 
2.34.1