dm: reject trailing characters in sccanf input

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / md / dm-queue-length.c

diff --git a/drivers/md/dm-queue-length.c b/drivers/md/dm-queue-length.c
index 03a837aa5ce64ebd38af21d324e77b14cd5f4434..3941fae0de9fd79f875f5ea32ce14b03cb76d8aa 100644 (file)
--- a/drivers/md/dm-queue-length.c
+++ b/drivers/md/dm-queue-length.c
@@ -112,6 +112,7 @@ static int ql_add_path(struct path_selector *ps, struct dm_path *path,
        struct selector *s = ps->context;
        struct path_info *pi;
        unsigned repeat_count = QL_MIN_IO;
+       char dummy;
 
        /*
         * Arguments: [<repeat_count>]
@@ -123,7 +124,7 @@ static int ql_add_path(struct path_selector *ps, struct dm_path *path,
                return -EINVAL;
        }
 
-       if ((argc == 1) && (sscanf(argv[0], "%u", &repeat_count) != 1)) {
+       if ((argc == 1) && (sscanf(argv[0], "%u%c", &repeat_count, &dummy) != 1)) {
                *error = "queue-length ps: invalid repeat count";
                return -EINVAL;
        }