From: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Date: Tue, 23 Sep 2014 23:48:01 +0000 (-0400)
Subject: Fix: syscall filtering: NULL pointer deref
X-Git-Tag: v2.6.0-rc1~25
X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=cecef7f86625593d7e26337294ceda7252557f59;p=lttng-modules.git

Fix: syscall filtering: NULL pointer deref

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

diff --git a/lttng-syscalls.c b/lttng-syscalls.c
index cba00160..1489934f 100644
--- a/lttng-syscalls.c
+++ b/lttng-syscalls.c
@@ -1060,18 +1060,18 @@ int lttng_syscall_filter_disable(struct lttng_channel *chan,
 		goto error;
 	}
 	if (syscall_nr >= 0) {
-		if (!test_bit(syscall_nr, chan->sc_filter->sc)) {
+		if (!test_bit(syscall_nr, filter->sc)) {
 			ret = -EEXIST;
 			goto error;
 		}
-		bitmap_clear(chan->sc_filter->sc, syscall_nr, 1);
+		bitmap_clear(filter->sc, syscall_nr, 1);
 	}
 	if (compat_syscall_nr >= 0) {
-		if (!test_bit(compat_syscall_nr, chan->sc_filter->sc_compat)) {
+		if (!test_bit(compat_syscall_nr, filter->sc_compat)) {
 			ret = -EEXIST;
 			goto error;
 		}
-		bitmap_clear(chan->sc_filter->sc_compat, compat_syscall_nr, 1);
+		bitmap_clear(filter->sc_compat, compat_syscall_nr, 1);
 	}
 apply_filter:
 	if (!chan->sc_filter)