diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index feca16a47f57b5d5c999b5cfa6fa50e93c83607d..4cc1366c96a608eb0e411011ba2f5087f61e5ba6 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -882,49 +882,26 @@ bool ovl_is_metacopy_dentry(struct dentry *dentry) return (oe->numlower > 1); } -static ssize_t ovl_getxattr(struct dentry *dentry, char *name, char **value, - size_t padding) -{ - ssize_t res; - char *buf = NULL; - - res = vfs_getxattr(dentry, name, NULL, 0); - if (res < 0) { - if (res == -ENODATA || res == -EOPNOTSUPP) - return -ENODATA; - goto fail; - } - - if (res != 0) { - buf = kzalloc(res + padding, GFP_KERNEL); - if (!buf) - return -ENOMEM; - - res = vfs_getxattr(dentry, name, buf, res); - if (res < 0) - goto fail; - } - *value = buf; - - return res; - -fail: - pr_warn_ratelimited("failed to get xattr %s: err=%zi)\n", - name, res); - kfree(buf); - return 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) + res = vfs_getxattr(dentry, OVL_XATTR_REDIRECT, NULL, 0); + if (res == -ENODATA || res == -EOPNOTSUPP) return NULL; if (res < 0) - return ERR_PTR(res); + goto fail; + if (res == 0) + goto invalid; + + buf = kzalloc(res + padding + 1, GFP_KERNEL); + if (!buf) + return ERR_PTR(-ENOMEM); + + res = vfs_getxattr(dentry, OVL_XATTR_REDIRECT, buf, res); + if (res < 0) + goto fail; if (res == 0) goto invalid; @@ -943,6 +920,10 @@ char *ovl_get_redirect_xattr(struct dentry *dentry, int padding) invalid: pr_warn_ratelimited("invalid redirect (%s)\n", buf); res = -EINVAL; + goto err_free; +fail: + pr_warn_ratelimited("failed to get redirect (%i)\n", res); +err_free: kfree(buf); return ERR_PTR(res); }