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ovl: Fix dereferencing possible ERR_PTR() 

if ovl_encode_real_fh() fails, no memory was allocated
and the error in the error-valued pointer should be returned.

Fixes: 9b6faee074 ("ovl: check ERR_PTR() return value from ovl_encode_fh()")
Signed-off-by: Ding Xiang <dingxiang@cmss.chinamobile.com>
Cc: <stable@vger.kernel.org> # v4.16+
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Ding Xiang 2019-09-09 16:29:56 +08:00 committed by Miklos Szeredi
parent 0be0bfd2de
commit 97f024b917
1 changed files with 1 additions and 2 deletions
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3
fs/overlayfs/export.c
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@ -227,9 +227,8 @@ static int ovl_d_to_fh(struct dentry *dentry, char *buf, int buflen)
/* Encode an upper or lower file handle */
fh = ovl_encode_real_fh(enc_lower ? ovl_dentry_lower(dentry) :
ovl_dentry_upper(dentry), !enc_lower);
err = PTR_ERR(fh);
if (IS_ERR(fh))
goto fail;
return PTR_ERR(fh);
err = -EOVERFLOW;
if (fh->len > buflen)