[PATCH] lsm: Resolve compiling 'security.c' error

[Lu Yao]

The following error log is displayed during the current compilation
  > 'security/security.c:810:2: error: ‘memcpy’ offset 32 is
  > out of the bounds [0, 0] [-Werror=array-bounds]'

GCC version is '10.3.0 (Ubuntu 10.3.0-1ubuntu1~18.04~1)'

Signed-off-by: Lu Yao <yaolu at kylinos.cn>
---
 security/security.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/security.c b/security/security.c
index 0144a98d3712..37168f6bee25 100644
--- a/security/security.c
+++ b/security/security.c
@@ -792,7 +792,7 @@ int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, size_t *uctx_len,
 	size_t nctx_len;
 	int rc = 0;
 
-	nctx_len = ALIGN(struct_size(nctx, ctx, val_len), sizeof(void *));
+	nctx_len = ALIGN(sizeof(struct lsm_ctx) + val_len, sizeof(void *));
 	if (nctx_len > *uctx_len) {
 		rc = -E2BIG;
 		goto out;
-- 
2.25.1