From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Wed, 24 Sep 2014 16:17:03 +0000 (-0400)
Subject: Fix: don't allow disabling syscalls when none are enabled
X-Git-Tag: v2.6.0-rc1~23
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=bcde0d5b7da973a9372b3db4acc0b08b9589e05b;p=lttng-modules.git

Fix: don't allow disabling syscalls when none are enabled

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---

diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index 00584e3e..5cac7212 100644
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -1036,6 +1036,8 @@ int lttng_syscall_filter_disable(struct lttng_channel *chan,
 	WARN_ON_ONCE(!chan->sc_table);
 
 	if (!chan->sc_filter) {
+		if (!chan->syscall_all)
+			return -EEXIST;
 		filter = kzalloc(sizeof(struct lttng_syscall_filter),
 				GFP_KERNEL);
 		if (!filter)