net/sched: potential data corruption

The reset_policy() does:
        memset(d->tcfd_defdata, 0, SIMP_MAX_DATA);
        strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);

In the original code, the size of d->tcfd_defdata wasn't fixed and if
strlen(defdata) was less than 31, reset_policy() would cause memory
corruption.

Please Note:  The original alloc_defdata() assumes defdata is 32
characters and a NUL terminator while reset_policy() assumes defdata is
31 characters and a NUL.  This patch updates alloc_defdata() to match
reset_policy() (ie a shorter string).  I'm not very familiar with this
code so please review carefully.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Acked-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
index 1b4bc691d7d1d0b5d716ddc681f319e23c19c98c..4a1d640b0cf16d842a26e3de807df2d937752cc8 100644 (file)
--- a/net/sched/act_simple.c
+++ b/net/sched/act_simple.c
@@ -73,10 +73,10 @@ static int tcf_simp_release(struct tcf_defact *d, int bind)
 
 static int alloc_defdata(struct tcf_defact *d, char *defdata)
 {
-       d->tcfd_defdata = kstrndup(defdata, SIMP_MAX_DATA, GFP_KERNEL);
+       d->tcfd_defdata = kzalloc(SIMP_MAX_DATA, GFP_KERNEL);
        if (unlikely(!d->tcfd_defdata))
                return -ENOMEM;
-
+       strlcpy(d->tcfd_defdata, defdata, SIMP_MAX_DATA);
        return 0;
 }