We hit a BUG on kfree of an ERR_PTR()...
Reported-by: syzbot+ff03fe05c717b82502d0@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 8b88a2e64036 ("ovl: verify upper root dir matches lower root dir")
Cc: <stable@xxxxxxxxxxxxxxx> # v4.13
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/overlayfs/namei.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
index 9c0ca6a7becf..efd372312ef1 100644
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -422,8 +422,10 @@ int ovl_verify_set_fh(struct dentry *dentry, const char *name,
fh = ovl_encode_real_fh(real, is_upper);
err = PTR_ERR(fh);
- if (IS_ERR(fh))
+ if (IS_ERR(fh)) {
+ fh = NULL;
goto fail;
+ }
err = ovl_verify_fh(dentry, name, fh);
if (set && err == -ENODATA)
--
2.17.1
