logfs: handle errors from get_mtd_device()

The get_mtd_device() function returns error pointers on failure and if we
don't handle it, it leads to a crash.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Joern Engel <joern@logfs.org>

diff --git a/fs/logfs/dev_mtd.c b/fs/logfs/dev_mtd.c
index cafb6ef..b02a402 100644 (file)
--- a/fs/logfs/dev_mtd.c
+++ b/fs/logfs/dev_mtd.c
@@ -250,5 +250,7 @@ int logfs_get_sb_mtd(struct file_system_type *type, int flags,
        const struct logfs_device_ops *devops = &mtd_devops;
 
        mtd = get_mtd_device(NULL, mtdnr);
+       if (IS_ERR(mtd))
+               return PTR_ERR(mtd);
        return logfs_get_sb_device(type, flags, mtd, NULL, devops, mnt);
 }