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[NET]: Validate socket filters against BPF_MAXINSNS in one spot.

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Currently the checks are scattered all over and this leads
to inconsistencies and even cases where the check is not made.

Based upon a patch from Kris Katterjohn.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2005-12-27 13:57:59 -08:00
parent 6732badee0
commit 1b93ae64ca
2 changed files with 2 additions and 5 deletions
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3
drivers/net/ppp_generic.c
View File

@ -524,9 +524,6 @@ static int get_filter(void __user *arg, struct sock_filter **p)
if (copy_from_user(&uprog, arg, sizeof(uprog)))
return -EFAULT;
if (uprog.len > BPF_MAXINSNS)
return -EINVAL;
if (!uprog.len) {
*p = NULL;
return 0;

4
net/core/filter.c
View File

@ -293,7 +293,7 @@ int sk_chk_filter(struct sock_filter *filter, int flen)
struct sock_filter *ftest;
int pc;
if (((unsigned int)flen >= (~0U / sizeof(struct sock_filter))) || flen == 0)
if (flen == 0 || flen > BPF_MAXINSNS)
return -EINVAL;
/* check the filter code now */
@ -360,7 +360,7 @@ int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
int err;
/* Make sure new filter is there and in the right amounts. */
if (fprog->filter == NULL || fprog->len > BPF_MAXINSNS)
if (fprog->filter == NULL)
return -EINVAL;
fp = sock_kmalloc(sk, fsize+sizeof(*fp), GFP_KERNEL);