1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 467a4f177bfb..c356c0a30c3e 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -447,7 +447,7 @@ struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
                 for (i=0; i< MAX_MTD_DEVICES; i++)
                         if (mtd_table[i] == mtd)
                                 ret = mtd_table[i];
-        } else if (num < MAX_MTD_DEVICES) {
+        } else if (num >= 0 && num < MAX_MTD_DEVICES) {
                 ret = mtd_table[num];
                 if (mtd && mtd != ret)
                         ret = NULL;