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-rw-r--r--lib/dynamic_debug.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index bd7b3aaa93c3..c70d6347afa2 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -561,9 +561,14 @@ static int ddebug_exec_queries(char *query, const char *modname)
int dynamic_debug_exec_queries(const char *query, const char *modname)
{
int rc;
- char *qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
+ char *qry; /* writable copy of query */
- if (!query)
+ if (!query) {
+ pr_err("non-null query/command string expected\n");
+ return -EINVAL;
+ }
+ qry = kstrndup(query, PAGE_SIZE, GFP_KERNEL);
+ if (!qry)
return -ENOMEM;
rc = ddebug_exec_queries(qry, modname);