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ovl: check ERR_PTR() return value from ovl_encode_fh() 

Another fix for an issue reported by 0-day robot.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 8ed5eec9d6 ("ovl: encode pure upper file handles")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Amir Goldstein 2018-01-30 13:54:45 +02:00 committed by Miklos Szeredi
parent 2aed489d16
commit 9b6faee074
1 changed files with 3 additions and 0 deletions
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3
fs/overlayfs/export.c
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@ -108,6 +108,9 @@ static int ovl_d_to_fh(struct dentry *dentry, char *buf, int buflen)
/* Encode an upper or origin file handle */
fh = ovl_encode_fh(origin ?: ovl_dentry_upper(dentry), !origin);
err = PTR_ERR(fh);
if (IS_ERR(fh))
goto fail;
err = -EOVERFLOW;
if (fh->len > buflen)