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Diffstat (limited to 'fs/overlayfs/util.c')
-rw-r--r--fs/overlayfs/util.c55
1 files changed, 35 insertions, 20 deletions
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 7c01327b1852..4035e640f402 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -863,28 +863,49 @@ bool ovl_is_metacopy_dentry(struct dentry *dentry)
return (oe->numlower > 1);
}
-char *ovl_get_redirect_xattr(struct dentry *dentry, int padding)
+ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value,
+ size_t padding)
{
- int res;
- char *s, *next, *buf = NULL;
+ ssize_t res;
+ char *buf = NULL;
- res = vfs_getxattr(dentry, OVL_XATTR_REDIRECT, NULL, 0);
+ res = vfs_getxattr(dentry, name, NULL, 0);
if (res < 0) {
if (res == -ENODATA || res == -EOPNOTSUPP)
- return NULL;
+ return -ENODATA;
goto fail;
}
- buf = kzalloc(res + padding + 1, GFP_KERNEL);
- if (!buf)
- return ERR_PTR(-ENOMEM);
+ if (res != 0) {
+ buf = kzalloc(res + padding, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
- if (res == 0)
- goto invalid;
+ res = vfs_getxattr(dentry, name, buf, res);
+ if (res < 0)
+ goto fail;
+ }
+ *value = buf;
+
+ return res;
+
+fail:
+ pr_warn_ratelimited("overlayfs: failed to get xattr %s: err=%zi)\n",
+ name, res);
+ kfree(buf);
+ return res;
+}
- res = vfs_getxattr(dentry, OVL_XATTR_REDIRECT, buf, res);
+char *ovl_get_redirect_xattr(struct dentry *dentry, int padding)
+{
+ int res;
+ char *s, *next, *buf = NULL;
+
+ res = ovl_getxattr(dentry, OVL_XATTR_REDIRECT, &buf, padding + 1);
+ if (res == -ENODATA)
+ return NULL;
if (res < 0)
- goto fail;
+ return ERR_PTR(res);
if (res == 0)
goto invalid;
@@ -900,15 +921,9 @@ char *ovl_get_redirect_xattr(struct dentry *dentry, int padding)
}
return buf;
-
-err_free:
- kfree(buf);
- return ERR_PTR(res);
-fail:
- pr_warn_ratelimited("overlayfs: failed to get redirect (%i)\n", res);
- goto err_free;
invalid:
pr_warn_ratelimited("overlayfs: invalid redirect (%s)\n", buf);
res = -EINVAL;
- goto err_free;
+ kfree(buf);
+ return ERR_PTR(res);
}