1 files changed, 6 insertions, 4 deletions

diff --git a/lib/kasprintf.c b/lib/kasprintf.c
index f194e6e593e1..7f6c506a4942 100644
--- a/lib/kasprintf.c
+++ b/lib/kasprintf.c
@@ -13,19 +13,21 @@
 /* Simplified asprintf. */
 char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
 {
-        unsigned int len;
+        unsigned int first, second;
         char *p;
         va_list aq;
 
         va_copy(aq, ap);
-        len = vsnprintf(NULL, 0, fmt, aq);
+        first = vsnprintf(NULL, 0, fmt, aq);
         va_end(aq);
 
-        p = kmalloc_track_caller(len+1, gfp);
+        p = kmalloc_track_caller(first+1, gfp);
         if (!p)
                 return NULL;
 
-        vsnprintf(p, len+1, fmt, ap);
+        second = vsnprintf(p, first+1, fmt, ap);
+        WARN(first != second, "different return values (%u and %u) from vsnprintf(\"%s\", ...)",
+             first, second, fmt);
 
         return p;
 }