LU-12784 llite: limit max xattr size by kernel value

[fs/lustre-release.git] / lustre / llite / lproc_llite.c

diff --git a/lustre/llite/lproc_llite.c b/lustre/llite/lproc_llite.c
index c676ed6..6f26f49 100644 (file)
--- a/lustre/llite/lproc_llite.c
+++ b/lustre/llite/lproc_llite.c
@@ -918,7 +918,9 @@ static ssize_t max_easize_show(struct kobject *kobj,
        if (rc)
                return rc;
 
-       return sprintf(buf, "%u\n", ealen);
+       /* Limit xattr size returned to userspace based on kernel maximum */
+       return snprintf(buf, PAGE_SIZE, "%u\n",
+                       ealen > XATTR_SIZE_MAX ? XATTR_SIZE_MAX : ealen);
 }
 LUSTRE_RO_ATTR(max_easize);
 
@@ -946,7 +948,9 @@ static ssize_t default_easize_show(struct kobject *kobj,
        if (rc)
                return rc;
 
-       return sprintf(buf, "%u\n", ealen);
+       /* Limit xattr size returned to userspace based on kernel maximum */
+       return snprintf(buf, PAGE_SIZE, "%u\n",
+                       ealen > XATTR_SIZE_MAX ? XATTR_SIZE_MAX : ealen);
 }
 
 /**