block: avoid using uninitialized value in from queue_var_store

[~andy/linux] / block / blk-sysfs.c

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 6206a934eb8c85a2f21636759f1b64afe8e3fb70..5efc5a647183b688fe0e4312c7ad5bcb3dad403b 100644 (file)
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -229,6 +229,8 @@ queue_store_##name(struct request_queue *q, const char *page, size_t count) \
        unsigned long val;                                              \
        ssize_t ret;                                                    \
        ret = queue_var_store(&val, page, count);                       \
+       if (ret < 0)                                                    \
+                return ret;                                            \
        if (neg)                                                        \
                val = !val;                                             \
                                                                        \