On failure to prepare_creds(), mount fails with a random
return value, as err was last set to an integer cast of
a valid lower mnt pointer or set to 0 if inodes index feature
is enabled.
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Fixes: 3fe6e52f0626 ("ovl: override creds with the ones from ...")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.7
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/overlayfs/super.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 44dc2d6ffe0f..1cf5d3538309 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1090,6 +1090,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
else
sb->s_d_op = &ovl_dentry_operations;
+ err = -ENOMEM;
ufs->creator_cred = cred = prepare_creds();
if (!cred)
goto out_put_indexdir;
--
2.7.4