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ovl: fix error handling in ovl_verify_set_fh() 

We hit a BUG on kfree of an ERR_PTR()...

Reported-by: syzbot+ff03fe05c717b82502d0@syzkaller.appspotmail.com
Fixes: 8b88a2e640 ("ovl: verify upper root dir matches lower root dir")
Cc: <stable@vger.kernel.org> # v4.13
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2018-10-10 19:10:06 +03:00 committed by Miklos Szeredi
parent 84df9525b0
commit babf4770be
1 changed files with 3 additions and 1 deletions
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4
fs/overlayfs/namei.c
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@ -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)