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-rw-r--r--lib/vsprintf.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index e5ab51fc2d9..99747a58ec7 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1496,13 +1496,14 @@ do { \
case FORMAT_TYPE_STR: {
const char *save_str = va_arg(args, char *);
size_t len;
+
if ((unsigned long)save_str > (unsigned long)-PAGE_SIZE
|| (unsigned long)save_str < PAGE_SIZE)
save_str = "(null)";
- len = strlen(save_str);
- if (str + len + 1 < end)
- memcpy(str, save_str, len + 1);
- str += len + 1;
+ len = strlen(save_str) + 1;
+ if (str + len < end)
+ memcpy(str, save_str, len);
+ str += len;
break;
}