[RFC PATCH 1/3] lsm: cleanup the size counters in security_getselfattr()

[Paul Moore]

Zero out all of the size counters in the -E2BIG case (buffer too
small) to help make the current code a bit more robust in the face of
future code changes.

Signed-off-by: Paul Moore <paul at paul-moore.com>
---
 security/security.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/security/security.c b/security/security.c
index 988483fcf153..9c63acded4ee 100644
--- a/security/security.c
+++ b/security/security.c
@@ -3951,8 +3951,9 @@ int security_getselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
 			continue;
 		}
 		if (rc == -E2BIG) {
-			toobig = true;
+			rc = 0;
 			left = 0;
+			toobig = true;
 		} else if (rc < 0)
 			return rc;
 		else
-- 
2.42.0