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authorDan Carpenter <error27@gmail.com>2010-07-14 17:56:37 -0700
committerDavid S. Miller <davem@davemloft.net>2010-07-14 17:56:37 -0700
commit0eff683f737bf684dc9299e2eaca79cceb80a8c1 (patch)
treeab92685be15606c06dbab82c581a3b1c0da72986 /net/sched
parentnetxen: fix for kdump (diff)
downloadlinux-dev-0eff683f737bf684dc9299e2eaca79cceb80a8c1.tar.xz
linux-dev-0eff683f737bf684dc9299e2eaca79cceb80a8c1.zip
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>
Diffstat (limited to 'net/sched')
-rw-r--r--net/sched/act_simple.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sched/act_simple.c b/net/sched/act_simple.c
index 1b4bc691d7d1..4a1d640b0cf1 100644
--- 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;
}