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-rw-r--r--security/security.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/security/security.c b/security/security.c
index 5b2e0a15377d..7e118858b545 100644
--- a/security/security.c
+++ b/security/security.c
@@ -780,7 +780,9 @@ static int lsm_superblock_alloc(struct super_block *sb)
* @id: LSM id
* @flags: LSM defined flags
*
- * Fill all of the fields in a userspace lsm_ctx structure.
+ * Fill all of the fields in a userspace lsm_ctx structure. If @uctx is NULL
+ * simply calculate the required size to output via @utc_len and return
+ * success.
*
* Returns 0 on success, -E2BIG if userspace buffer is not large enough,
* -EFAULT on a copyout error, -ENOMEM if memory can't be allocated.
@@ -799,6 +801,10 @@ int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, u32 *uctx_len,
goto out;
}
+ /* no buffer - return success/0 and set @uctx_len to the req size */
+ if (!uctx)
+ goto out;
+
nctx = kzalloc(nctx_len, GFP_KERNEL);
if (nctx == NULL) {
rc = -ENOMEM;