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path: root/fs/overlayfs/super.c
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Diffstat (limited to 'fs/overlayfs/super.c')
-rw-r--r--fs/overlayfs/super.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index ab3c8cb8e52d..edbb3ebcdaad 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -870,8 +870,14 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
err = -EINVAL;
stacklen = ovl_split_lowerdirs(lowertmp);
- if (stacklen > OVL_MAX_STACK)
+ if (stacklen > OVL_MAX_STACK) {
+ pr_err("overlayfs: too many lower directries, limit is %d\n",
+ OVL_MAX_STACK);
goto out_free_lowertmp;
+ } else if (!ufs->config.upperdir && stacklen == 1) {
+ pr_err("overlayfs: at least 2 lowerdir are needed while upperdir nonexistent\n");
+ goto out_free_lowertmp;
+ }
stack = kcalloc(stacklen, sizeof(struct path), GFP_KERNEL);
if (!stack)