[PATCH RFC 4/5] kdbus: handle WARN_ON cases properly when decrementing quota

[Sergei Zviagintsev]

If we spotted inconsistency, fix it by setting values to zero.

Signed-off-by: Sergei Zviagintsev <sergei@xxxxxxxx>
---
 ipc/kdbus/connection.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/ipc/kdbus/connection.c b/ipc/kdbus/connection.c
index 1d44e280eff0..12e32de310f5 100644
--- a/ipc/kdbus/connection.c
+++ b/ipc/kdbus/connection.c
@@ -742,9 +742,15 @@ void kdbus_conn_quota_dec(struct kdbus_conn *c, struct kdbus_user *u,
 
 	if (!WARN_ON(quota->msgs == 0))
 		--quota->msgs;
-	if (!WARN_ON(quota->memory < memory))
+
+	if (WARN_ON(quota->memory < memory))
+		quota->memory = 0;
+	else
 		quota->memory -= memory;
-	if (!WARN_ON(quota->fds < fds))
+
+	if (WARN_ON(quota->fds < fds))
+		quota->fds = 0;
+	else
 		quota->fds -= fds;
 }
 
-- 
1.8.3.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/