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authorMinoru Usui <usui@mxm.nes.nec.co.jp>2009-06-09 04:03:09 -0700
committerDavid S. Miller <davem@davemloft.net>2009-06-09 04:03:09 -0700
commit52ea3a56a3268bc2a5a7c75e98c81463004e38ef (patch)
tree4f99bbf8015d252c1a145a1b610db9eddb192f98 /net/sched/cls_cgroup.c
parentfdd7b4c3302c93f6833e338903ea77245eb510b4 (diff)
cls_cgroup: Fix oops when user send improperly 'tc filter add' request
I found a bug in cls_cgroup_change() in cls_cgroup.c. cls_cgroup_change() expected tca[TCA_OPTIONS] was set from user space properly, but tc in iproute2-2.6.29-1 (which I used) didn't set it. In the current source code of tc in git, it set tca[TCA_OPTIONS]. git://git.kernel.org/pub/scm/linux/kernel/git/shemminger/iproute2.git If we always use a newest iproute2 in git when we use cls_cgroup, we don't face this oops probably. But I think, kernel shouldn't panic regardless of use program's behaviour. Signed-off-by: Minoru Usui <usui@mxm.nes.nec.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/cls_cgroup.c')
-rw-r--r--net/sched/cls_cgroup.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index cc29b44b1500..e5becb92b3e7 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -167,6 +167,9 @@ static int cls_cgroup_change(struct tcf_proto *tp, unsigned long base,
struct tcf_exts e;
int err;
+ if (!tca[TCA_OPTIONS])
+ return -EINVAL;
+
if (head == NULL) {
if (!handle)
return -EINVAL;